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  • PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR  (175)
  • 1995-1999
  • 1980-1984
  • 1970-1974  (175)
  • 1950-1954
  • 1973  (175)
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  • Books
  • Other Sources  (175)
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  • 1995-1999
  • 1980-1984
  • 1970-1974  (175)
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  • 1
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    Solar flare alpha particles (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: Interplanetary disturbances frequently change the instantaneous values of the low energy solar flare alpha-to-proton flux ratios. The fluxes of alpha particles were integrated over the duration of seven large solar events occurring between May 28, 1967, and November 6, 1969, in order to investigate the total alpha particles fluxes observed at 1 AU resulting from the flares. The spectra of the event integrated alphas are always softer than the spectra of the event integrated protons. As a consequence, the event-integrated alpha-to-proton ratios decrease slightly with increasing energy per nucleon. The He-4/H-1 ratios averaged over the seven events are found to vary as 0.026 (E/nucl) sup -0.2 in the range 1 to 10 MeV/nucleon. The value of the ratio at 1 MeV/nucleon is less than the helium-to-hydrogen abundance determined from spectroscopic studies of prominences and the chromosphere, and is less than the average solar wind helium-to-hydrogen abundance.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA, Washington High Energy Phenomena on the Sun; p 427-438
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  • 2
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    Solar cosmic ray micro-events (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: To study small discrete solar particle events, it has proven useful to define a special class such that the proton flux at energies greater than 20 MeV exceed 0.0001 protons/sq cm-sec-sr-MeV. These increases are termed microevents. An arbitrary upper limit is placed at 2 X 0.02 protons/sq cm-sec-sr-MeV. By demanding a measurable flux above 20 MeV, a better separation from corotating events is achieved and onset times can in general be determined more precisely. Over an observing period extending from May 1967 through December 1971, approximately 105 events were observed. There are several different sources of these small events. Some are produced by moderate to large solar flares near the east limb or by solar flares on the nonvisible disk of the sun. Others are produced by generally minor solar activity: typically in 1N flare, a group of type 3 radio bursts and a well defined X-ray burst. A significant number of this latter type are accompanied by type 2 radio emission. A small sample of the micro-events can be classified as scatter-free events. For these the distance traveled by the particles before their initial detection at earth is on the order of 1.5 AU and observed rise and decay times are much less than normal. Examples of these general types of micro-events and their solar association are discussed.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: High Energy Phenomena on the Sun; p 404-417
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  • 3
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    Gyrosynchrotron radiation formulae (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: The wave-normal emissivity and the ray emissivity formulas for an electron moving along a helical path in a magnetoactive medium are presented. Simplified formulas for the case of an isotropic plasma are also given. Because of the helical motion of the electron, a difference exists between the radiated power per unit solid angle and the received power per unit solid angle. The relation between these two quantities in a magnetoactive medium is shown. Results are compared with those obtained by others, and the sources of discrepancies are pointed out.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA, Washington High Energy Phenomena on the Sun; p 198-206
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  • 4
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    Improved spatial uniformity of beam-plane interaction by means of inverse rastering (1973)
    In:  CASI
    Details
    Publication Date: 2006-02-22
    Description: An analysis is presented that shows the desirability and feasibility of conducting irradiations of large test objects by beams of penetrating radiation, by the method of moving the test object back and forth through the beam, rather than by sweeping the beam across the object. An extension of this method of inverse rastering allows the generation of composite beams with any desired intensity-vs-energy spectrum, obviating the need to determine equivalent damage factors for every energy in the spectrum.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: JPL Quart. Tech. Rev., Vol. 3, No. 2 (NASA-CR-133863); p 78-90
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  • 5
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    Energetic particle storage on the sun (1973)
    In:  CASI
    Details
    Publication Date: 2006-04-05
    Description: The storage of energetic electron and protons of energies much greater than 1 GeV in the solar corona is investigated.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA, Washington High Energy Phenomena on the Sun; p 503-515
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  • 6
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    Valence resonance states of N2/-/ (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Resonant scattering observed in the transmission of electrons between 9 and 11 eV in collision with N2 has been attributed to the attachment of the scattered electron to an excited valence state. Resonance valence excited states of N2(-) are calculated that could support this hypothesis. Although calculated and observed resonance energies are in close agreement, the calculations do not reflect the observed complex angular behavior of the scattered electron.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Research; vol. 77A
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  • 7
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    Intermediate energy nucleon-deuteron elastic scattering (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The adequacy of a multiple scattering description of nucleon-deuteron scattering at intermediate energy is examined. Although the multiple-scattering series is expected to converge slowly, model calculations indicate that the higher-order multiple-scattering terms contribute only to the low-order partial waves. The first two terms, nucleon exchange and single scattering, are assumed to describe the high-order partial waves completely. It is assumed that the deuteron is coupled only to the nucleon channel and that the internal structure is adequately defined by a nonrelativistic wave function.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Nuclear Physics; B66; 1973
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  • 8
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    Linewidths and transition probabilities for the carbon monoxide laser lines (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Oct. 15
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  • 9
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    Photoionization of carbon dioxide (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Investigation of the mechanism for dissociative ionization of CO2 on the basis of measurements of the yields of photoions from CO2. It is found that at photon energies immediately above the molecular ionization limit of 13.773 plus or minus 0.002 eV the photoion yield curve exhibits a number of closely spaced peaks in a pattern not resembling Rydberg series. Two fragment ions, O(+) and CO(+), are observed as products of dissociative ionization. The yield of O(+) follows a weak, oscillatory curve from the thermochemical threshold at 19.07 eV to 19.39 eV, where a sudden increase in O(+) yield is observed exactly at the onset of the state CO2(+)/C 2 Sigma g (+)/, indicating predissociation of this state of the molecular ion. The magnitude of the jump in O(+) yield at 19.39 eV suggests that this predissociation is the principal mechanism for dissociative ionization.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Oct. 15
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  • 10
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    The scattering of low energy positrons by helium (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Kohn's variational method is used to calculate the positron-helium scattering length and low energy S-wave phase shifts for a quite realistic Hylleraas type of helium function containing an electron-electron correlation term. The zero energy wavefunction is used to calculate the value of the annihilation rate parameter Z sub eff. All the results are significantly different from those for Drachman's helium model B, but are in better agreement with the available experimental data.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Physics; vol. 6
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  • 11
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    Ground state properties of spin-alined atomic hydrogen (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Theoretical calculation of the ground state properties of spin-alined atomic hydrogen by the Monte Carlo method. The interatomic interaction, as described by the results of Kolos and Wolniewicz (1965), is made fit to a Morse potential form. An appropriate trail wavefunction is formed from the short-range part of the WKB solution for a pair of atoms interacting through a Morse potential.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Dec. 1
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  • 12
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    Glauber-theory approach for molecular vibrational excitations (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Molecular vibrational excitations by charged-particle impact are investigated within the Glauber-theory approach. Theoretical results for electron-H2 scattering give good agreement with experimental data. We study the physical effects responsible for the structures in the differential cross section.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review Letters; 31; Oct. 29
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  • 13
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    A useful approximation and simple scaling laws for predicting ion-dipole capture cross sections and rate coefficients (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Chemical Physics Letters; 21; Sept. 1
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  • 14
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    Theoretical study of H2/+/ spectroscopic properties. II, III (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Description of the theoretical spectroscopic properties of the 2p pi/sub u/ and 3d sigma/sub g/ excited states of the H2/+/ hydrogen molecular ion. Numerical integration of the Schrodinger equation is used to determine vibration-rotation eigenvalues. Dunham power series expansions are used to determine the equilibrium separation, potential coefficients, and spectroscopic constants. The eigenvalues are used to determine delta-G, Bv, Dv, and Hv.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Nov. 15
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  • 15
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    Generalized charge in the eight-component spin 1/2 wave equation (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Foundations of Physics; 3; Sept
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  • 16
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    Calculated term energies and transition probabilities for ions in the fluorine isoelectronic sequence (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Optical Society of America; vol. 63
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  • 17
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    Semiprecision calculations of electron-hydrogen resonances (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Results of a calculation of the lowest (1 S) resonance below the first excitation threshold in electron-hydrogen scattering. This calculation is based on a precision Hylleraas calculation of the resonant wave function, combined with various reasonable physically motivated approximations for the nonresonant continuum. These approximations are basically the exchange- and polarized-orbital approximations. The values obtained, together with previous results obtained for the two higher (3 P and 1 D) resonances, are compared with the previous most accurate calculations, and some differences are noted.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 8
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  • 18
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    Competition between charge exchange and chemical reaction - The D2/+/ + H system (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Study of the special features of molecular charge exchange and its competition with chemical reaction in the case of the D2(+) + H system. The trajectory surface hopping (TSH) model proposed by Tully and Preston (1971) is used to study this competition for a number of reactions involving the above system. The diatomics-in-molecules zero-overlap approximation is used to calculate the three adiabatic surfaces - one triplet and two singlet - which are needed to describe this system. One of the significant results of this study is that the chemical reaction and charge exchange are strongly coupled. It is also found that the number of trajectories passing into the chemical regions of the three surfaces depends very strongly on the surface crossings.-
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Oct. 1
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  • 19
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    The formation of resonance lines in multidimensional media. II - Radiation operators and their numerical representation. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Astrophysical Journal; 185; Oct. 1
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  • 20
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    Computer checking of rotational line intensity factors for diatomic transitions. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Previously published analytical formulae for the rotational line intensity factors of diatomic molecules have been compared with results from a comprehensive computer program, which determines numerical intensity factors for both spin-allowed and spin-forbidden electric and magnetic dipole transitions in diatomic molecules. The comparison uncovered several typographical errors and a few algebraic errors in the published formulae. The changes required in the formulae to give agreement with the results from the computer program are tabulated.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Molecular Spectroscopy; 47; July 197
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  • 21
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    Reaction Li-6/p, pt/ at 590 MeV. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A lithium target enriched to 95.6 per cent of Li-6 and 0.685 cm thick was bombarded in the 590-MeV proton beam of a synchrocyclotron. Coincident events were detected in a double telescope arrangement. The characteristics of the unobserved three-nucleon residual system calculated for each event include the missing energy, the longitudinal recoil, and the transverse recoil. The cross-section data obtained indicate that zero recoil momentum for the unobserved three-nucleon recoil system is the most likely situation.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review C - Nuclear Physics; vol. 8
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  • 22
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    Muon capture rates on O-16 leading to bound states of N-16. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A low-energy spectrum of gamma-rays following muon capture in O-16 was obtained with a high-resolution 1 cu cm Ge(Li) detector. The graph of the spectrum shows the separation of contaminant peaks from the 120 keV N-16 line. It is pointed out that there is a large discrepancy between the capture rate obtained in the investigation and results reported by Deutsch et al. (1969).
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physics Letters; 45B; July 23
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  • 23
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    Polarization phenomena in multiphoton ionization of atoms. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The theory of multiphoton ionization for an atomic system of arbitrary complexity is developed using a density matrix formalism. An expression is obtained which determines the differential N-photon ionization cross section as a function of the polarization states of the target atom and the incident radiation. The parameters which characterize the photo-electron angular distribution are related to the general reduced matrix elements for the N-photon transition. Two-photon ionization of unpolarized atoms is treated as an illustration of the use of the theory. The dependence of the multiphoton ionization cross section on the polarization state of the incident radiation, which has been observed in two- and three-photon ionization of Cs, is accounted for by the theory. Finally, the photoelectron spin polarization produced by the multiphoton ionization of unpolarized atoms, like the analogous polarization resulting from single-photon ionization, is found to depend on the circular polarization of the incident radiation.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Physics; vol. 6
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  • 24
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    Relative Raman cross section of O3 for four Ar+ laser frequencies. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Applied Physics; 44; Aug. 197
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  • 25
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    Comparison of electron and electronic temperatures in recombining nozzle flow of ionized nitrogen-hydrogen mixture. I, II. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Relaxation of the population distribution of electronic states is studied theoretically for a highly ionized nitrogen-hydrogen mixture expanding through a nozzle wherein the hydrogen content is less than 0.1%. The analysis incorporates quantum-mechanical rate coefficients, and considers the effects of wall cooling and absorption of radiation. Calculations are carried out for a condition produced experimentally. Visible and infrared line radiations from nitrogen and hydrogen were measured with a spectrograph. The geometry and stagnation conditions were those calculated theoretically. The experiment confirms quantitatively the predictions that the electronic excitation temperatures of hydrogen and (3P) core states of nitrogen are higher than the electron temperature, and that (3P) excitation temperatures exhibit maxima within the nozzle.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Plasma Physics; 9; Apr. 197
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  • 26
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    High-energy electron-beam deposition onto a hot graphite surface. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The momentum transfer and blow-off vapor yield resulting from the deposition of a pulsed high-power electron beam onto a plane graphite target with surface temperatures of 300 K and 5000 K are examined experimentally. The results show that with identical electron beams the momentum transfer and vapor yield are between two and three times larger when irradiating the 5000 K surface as compared with the 300 K surface.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Applied Physics Letters; 22; Feb. 15
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  • 27
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    Spin contamination in unrestricted Hartree-Fock calculations. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Several pi-electron doublets are treated by both the unrestricted Hartree-Fock method and the restricted approximation of Longuet-Higgins and Pople. For two of the molecules, which contain oxygen heteroatoms, serious spin contamination occurs in the UHF wavefunctions, and this negates the usefulness of the single annihilation procedure that is often used for spin-density calculations. The restricted approximation provides a convenient alternative, especially because configuration interaction is easily taken into account.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Aug. 15
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  • 28
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    Nonequilibrium effects on shock-layer radiometry during earth entry. (1973)
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    Publication Date: 2011-08-16
    Description: Radiative enhancement factors for the CN violet and N2(+) first negative band systems caused by nonequilibrium thermochemistry in the shock layer of a blunt-nosed vehicle during earth entry are reported. The results are based on radiometric measurements obtained with the aid of a combustion-driven shock tube. The technique of converting the shock-tube measurements into predictions of the enhancement factors for the blunt-body case is described, showing it to be useful for similar applications of other shock-tube measurements.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 13; Sept
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  • 29
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    Momentum transfer and total scattering cross sections for ions with polar molecules. (1973)
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 58; June 15
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  • 30
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    Intermediate energy nucleon-deuteron scattering theory. (1973)
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    Publication Date: 2011-08-16
    Description: Sloan's conclusion (1969) that terms of the multiple-scattering series beyond single scattering contribute only to S- and P-wave amplitudes in an S-wave separable model is examined. A comparison of experiments with the calculation at 146 MeV shows that the conclusion is valid in nucleon-deuteron scattering applications.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physics Letters; 44B; Apr. 16
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  • 31
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    Width of atomic L2 and L3 vacancy states near Z=30. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Results of an investigation of the discontinuity in the L2 level width and the L3-M45M45/L2-M45M45 Auger intensity ratio at Z=30. The afore-mentioned intensity ratio is found to undergo a sudden decrease at Z=30. Relative L2 and L3 level widths of Cu and Zn are derived from photoelectron spectra; while the L3 width increases from Cu to Zn, the L2 width of Cu is greater than that of Zn, contrary to the general trend. The above-mentioned discontinuity is traced to a discontinuity in the Coster-Kronig transition probability f sub 23 predicted in earlier calculations.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 7
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  • 32
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    A quantum model for bending vibrations and thermodynamic properties of C3. (1973)
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    Publication Date: 2011-08-16
    Description: The investigation reported was conducted to clarify the thermodynamic properties of C3 by further developing the limit to the partition function suggested by Strauss and Thiele (1967). A quantum solution for the energy levels of a quadratically perturbed square well potential is presented and the consistency of this limit with observed energy levels is established. In the process a more complete physical picture of the bending C3 molecules emerges. The values of entropy deduced from various measurements of graphite pressure are compared with this limit, and the thermodynamic properties predicted for the limiting case are evaluated.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Canadian Journal of Physics; 51; Apr. 1
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  • 33
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    Pair annihilation into neutrinos in strong magnetic fields. (1973)
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    Publication Date: 2011-08-16
    Description: Among the processes that are of primary importance for the thermal history of a neutron star is electron-positron annihilation into neutrinos and photoneutrinos. These processes are computed in the presence of a strong magnetic field typical of neutron stars, and the results are compared with the zero-field case. It is shown that the neutrino luminosity Q(H) is greater than Q(O) for temperatures up to T about equal to 3 x 10 to the 8th power K and densities up to 1,000,000 g/cu cm.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review D - Particles and Fields; vol. 7
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  • 34
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    Inelastic collision of fast charged particles with arbitrary levelled hydrogen-like atoms. (1973)
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Physics; vol. 6
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  • 35
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    Antimatter in the universe (1973)
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    Publication Date: 2011-08-16
    Description: The means of detecting the presence of antimatter in the universe are discussed. Both direct, annihilation processes, and indirect, cosmic ray particles, were analyzed. All results were negative and it was concluded that no antimatter exists, if the universe is in fact symmetric. If the universe is not symmetric then matter and antimatter are well separated from each other.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA. Goddard Space Flight Center Gamma-Ray Astrophys.; p 361-366
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    Positronium formation red shift of the 511-keV annihilation line (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: An examination was made of positronium formation in a gas and the 511 keV red shift spectrum produced by the formation.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA. Goddard Space Flight Center Gamma-Rays Astrophys.; p 291-296
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  • 37
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    Stark broadening of high-principal-quantum-number n-alpha lines of hydrogen. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: High n-alpha lines (transitions n + 1 to n) with quantum numbers n between 50 and 250 have been observed emanating from galactic H II regions where the electron density and temperature are about 1000/cu cm and 1 eV, respectively. High n-alpha lines have not previously been seen in the laboratory where fairly homogeneous plasmas may be produced and relatively precise measurements of electron densities and temperatures can be made. The present work describes experiments where the first members of the hydrogen line series with lower states n = 10, 11, 12, and 13 have been detected in a laboratory plasma. The width of the 12-alpha line at 88.7 microns could be measured and was consistent with calculated broadening from elastic electron collisions and quasi-static ion effects.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review Letters; 30; May 14
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  • 38
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    Empirical intermolecular potentials for N2 and CO2 from crystal data. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 58; May 1
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  • 39
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    Excited electronic states of O2/-/. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Configuration interaction (CI) variational trial functions (which assure formally correct dissociation) and the single-configuration self-consistent-field approximation are applied to the calculation of the excited electronic states of the negatively charged oxygen molecule. The energy curves and wave functions of these states are analyzed. All the excited states are found to have equilibrium-internuclear separations at least 1 a.u. larger than the ground state. The two lowest energy states are characterized, respectively, as shape and valence Feshbach resonances.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; Series
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  • 40
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    The Deuterium Puzzle in the Symmetric Universe (1973)
    In:  CASI
    Details
    Publication Date: 2014-09-04
    Description: The examination of the experimental data concerning the reaction antiproton + He-4 yields pions + nuclei shows that the low abundance of D 2 can be explained only by assuming a low He abundance at the beginning of the radiative era. This is a completely independant confirmation of the evasion of neutrons (and antineutrons) from the emulsion before the end of the epoch where nucleogenesis might have taken place, and leads to an estimate of the size of the emulsion when T = 1 MeV.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA. Goddard Space Flight Center Intern. Symp. and Workshop on Gamma-Ray Astrophysics; 15 p
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  • 41
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    Molecule formation in normal clouds (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Some aspects of molecule formation in normal interstellar clouds, i.e., clouds having particle densities of less than 100 per cu cm, are discussed in light of recent studies. It is pointed out that, with their relatively large depletion parameter values (DPVs), CH clouds are 'young', whereas OH clouds have small DPVs and are 'old'. The theoretical reason for this is that OH, as a product of grain catalysis, persists over a much longer period of cloud evolution, whereas CH(+), CH, and CN, as products of gas-phase reaction, can be found only in 'young' clouds where depletion has not yet occurred. This may explain why OH has not been seen in radio observations of regions where CH(+), CH, and CN have been seen optically.
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  • 42
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    Molecule formation by inverse predissociation (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The general theory of inverse predissociation is described, and is applied to specific molecules. The list of molecules which can be formed by radiative association will be lengthened considerably by considering this phenomenon. Typical rate constants for diatoms will lie in the range 10 to the minus 16th power to 10 to the minus 20th power cu cm/sec/molecule, with the heavy atom molecules such as CN, CO, or NO generally having larger rates than the hydrides. An attempt is made to point out what molecular characteristics determine the radiative association rate and also to make estimates of what rates may be expected for various interstellar molecules. The formal theory is developed, and the molecular properties are discussed which determine the inverse predissociation rate. The details of the theory as applied to specific interstellar molecules are studied.
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  • 43
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    High-resolution magnetic hyperfine resonance in harmonically bound ground-state Hg-199 ions. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review Letters; 30; June 4
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  • 44
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    Asymptotic form for the cross section for the Coulomb interacting rearrangement collisions. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: It is shown that in a rearrangement collision leading to the formation of highly excited hydrogenlike states the cross section at high energies behaves as 1/n-squared, with n the principal quantum number, thus invalidating the Brinkman-Kramers approximation for large n. Similarly, in high-energy inelastic electron-hydrogenlike-atom collisions the exchange cross section for sufficiently large n dominates the direct excitation cross section.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review Letters; 30; May 14
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  • 45
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    Neutron emission following muon capture in Ce-142, Ce-140, Ba-138, and Sn-120. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Branching ratios to excited nuclear states formed after muon capture have been measured with Ge(Li) detectors. The delayed gamma rays were observed in studies of muonic Ce-142, Ce-140, Ba-138, and Sn-120, using separated isotopes. The resulting isotopes formed indicate at least a 60% probability of neutron emission upon muon capture, with the most likely product resulting from single-neutron emission. No evidence for delayed proton emission with a probability higher than 2% was found. Using our more precise energies for the observed nuclear transitions, we present revised energy levels schemes for La-141, La-139, Cs-137, and In-119.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review C - Nuclear Physics; vol. 7
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  • 46
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    Photoneutrino energy losses in strong magnetic fields. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Previously computed rates of energy losses (Petrosian et al., 1967) ignored the presence of strong magnetic fields, hence the change brought in when such a field (about 10 to the 12th to 10 to the 13th power G) is included is studied. The results indicate that for T about 10 to the 8th power K and densities rho of about 10,000 g/cu cm, the presence of a strong H field decreases the energy losses by at the most a factor between 10 and 100 in the region up to rho = 1,000,000 g/cu cm. At higher densities the neutrino emissivities are almost identical.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review D - Particles and Fields; vol. 7
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  • 47
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    Origin of hot ions observed in a modified Penning discharge. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Ions with a Maxwellian energy distribution and kinetic temperatures ranging from below 100 eV to several keV have been observed in a steady-state modified Penning discharge. Observations in the plasma, with capacitive probes at several azimuthal locations, are consistent with the existence of two distinct spokes rotating with different velocities in the sheath between the plasma and the anode ring. The faster (0.3-10 MHz) spoke consists of electrons rotating with the E/B drift velocity. The slow (0.06-0.8 MHz) spoke consists of ions, the measured thermal velocity of which is directly proportional to the spoke velocity. The interaction of the two spokes is apparently responsible for the observed electrostatic turbulence and ion thermalization.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physics of Fluids; 16; Feb. 197
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  • 48
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    A shock tube determination of the CN ground state dissociation energy and the CN violet electronic transition moment. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 13; Feb. 197
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  • 49
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    Phase operators and phase relations for photon states (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: For a quantized mode of the radiation field, the operator whose classical analog is the ordinary phase factor of the mode amplitudes has been shown to be nonunitary. A rigorous formulation of the phase P is given on the basis of the canonical factorization theorem. Many of the seemingly complex features of phase operators are found to be simple direct consequences of the general mathematical theory. It can be readily seen that P is a partial isometry but not a unitary operator. In contrast to the amplitude operator, it is found that P is not a spectral operator and that the set of phase eigenstates is not complete. Mathematically precise operator relations are developed, and a complete spectral analysis is given for each of the phase operators.-
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Mathematical Physics; 14; Dec. 197
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  • 50
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    Electric dipole moment and energy in H2-H2 and H2-H collisions (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Dec. 15
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  • 51
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    Remarks concerning the s-process (1973)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The abundances of Fe-58 and Co-59 are far too large to be compatible with an s-process acting on Fe-56 as the only essential seed material unless a sharp lower cut-off is introduced ad hoc into the flux distribution. This cut-off leads to a maximum in the abundance times cross-section curve around A = 60 for which there is evidence but which can naturally be explained as an image of the iron peak shifted by an almost uniform neutron flux. Further evidence supports the conclusion of Peters et al. that the iron peak must have been considerably smaller for the seed of the s-process than for the solar system matter.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Astronomy and Astrophysics; 28; 3; Nov. 197
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  • 52
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    Angular distributions and polarization fractions of helium resonance radiation (n 1P - 1 1S) in the extreme ultraviolet (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Angular intensity distributions of helium (n 1P - 1 1S) resonance photons with respect to the exciting electron beam are presented. The angular intensity distributions were measured at selected electron impact energies from 25 eV (near threshold) to 150 eV. Polarization fractions (Pi) were obtained by analyzing the data in terms of the theoretical relation between angular intensity distribution and Pi, i.e. Iota (theta) = Iota (90) (1 - Pi sq cos theta). The experimental values for Pi are compared with recent theoretical results and with previous experimental values for the (3 1P - 2 1S) transition.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TM-X-70543 , X-691-73-372
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  • 53
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    Study of photoemission and work function of large surface areas, phase 3, phase 4 (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The photoemission of materials which might be used in probe measurements of the exo-atmospheric electric field is considered by evaluating the wavelength dependence of their photoelectric yield for eleven elements over the range 800 to 3200 A. Yield data for zinc, copper beryllium, platinum, cadmium, graphite, carbon, gold, silver, tantalum, and tungsten show that copper-beryllium is a preferred material. Silver has one of the highest photoemissions when exposed to solar radiation.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-132877 , AVSD-0295-73-PR
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  • 54
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    Composition dependence of ion transport coefficients in gas mixtures (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A simple momentum-transfer theory for the composition dependence of ion mobilities and diffusion coefficients in gas mixtures at arbitrary field strengths is corrected, extended, and compared with a similar theory based on momentum and energy transfer, and with results based on direct solution of the Boltzmann equation by Kihara's method. Final equations are recommended for predicting composition dependences, given only results on ion mobilities and diffusion coefficients in the pure component gases.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-136228
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  • 55
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    On the reactions of N2 with O. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An application of the rigorous curve crossing theory reported by Delos and Thorson (1972) is presented and the current level of understanding regarding the reactions involving a nitrogen molecule and an oxygen atom is discussed. A theoretical analysis of these reactions had been conducted by Fisher and Bauer (1972). The characteristics of the unimolecular decomposition of nitrous oxide are considered together with the quenching of O(1 D) by molecular nitrogen and the vibrational relaxation of molecular nitrogen.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Sept. 1
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  • 56
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    Molecular collisions. XIX - The distorted wave approximation to atom-rigid symmetric top rotational excitation. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Aug. 15
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  • 57
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    A generalization of the equations governing the evolution of a particle distribution in a random force field. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Mathematical Physics; 14; Apr. 197
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  • 58
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    Theory of satellite structures on spectral-line profiles. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A systematic comparison with experiment of various explanations for the problem of satellite-band formation on spectral-line profiles was initiated. The experiments were performed under a variety of conditions in an effort to construct a consistent model of entire line shapes. A composite theory is detailed which is the result of the insights of many individuals. The calculations indicate that the main features of the problem, the line, the high-intensity red satellites, and the blue satellite can be described simultaneously. The results also indicate that widely different potentials can lead to very similar line profiles. Ancillary conclusions are presented concerning the role of Lennard-Jones potentials in line-shape calculations.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 7
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  • 59
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    Low-energy elastic differential scattering of He/++/ by He. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Experimental results are developed for the relative elastic differential scattering of He(++) by He for collision energies in the range 4 equal to or less than E equal to or less than 75 eV. In the analysis of the data, semiclassical considerations are utilized, assuming that the dynamics of the scattering is governed solely by the B and E states of He2(++). It is shown that existing ab initio calculations for the intermolecular potentials predict differential cross sections which are not in particularly good agreement with the experimental data.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review A - General Physics; vol. 7
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  • 60
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    Properties of resonance wave functions. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Construction and study of resonance wave functions corresponding to poles of the Green's function for several illustrative models of theoretical interest. Resonance wave functions obtained from the Siegert and Kapur-Peierls definitions of the resonance energies are compared. The comparison especially clarifies the meaning of the normalization constant of the resonance wave functions. It is shown that the wave functions may be considered renormalized in a sense analogous to that of quantum field theory. However, this renormalization is entirely automatic, and the theory has neither ad hoc procedures nor infinite quantities.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: AD-763541 , AFOSR-73-1181TR , Physical Review A - General Physics; vol. 7
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  • 61
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    Chemical reactivity of hydrogen, nitrogen, and oxygen atoms at temperatures below 100 k (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The synthesis of unusual compounds by techniques employing cryogenic cooling to retard their very extreme reactivity was investigated. Examples of such species that were studied are diimide (N2H2), cyclobutadiene (C4H4), cyclopropanone (C3H4O), oxirene (C2H2O), and many others. Special purpose cryogenically cooled inlet arrangements were designed such that the analyses incurred no warm-up of the cold, and frequently explosively unstable, compounds. Controlled energy electron impact techniques were used to measure critical potentials and to develop the molecular energetics and thermodynamics of these molecules and to gain some insight into their kinetic characteristics as well. Three and four carbon strained ring molecules were studied. Several reactions of oxygen and hydrogen atoms with simple molecules of H, N, C, and O in hard quench configurations were studied. And the quench stabilization of BH3 was explored as a model system in cryochemistry.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-133654
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  • 62
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    Calculated dipole moment and energy in collision of a hydrogen molecule and a hydrogen atom (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Calculations were carried out using three Slater-type 1s orbitals in the orthogonalized valencebond theory of McWeeny. Each orbital exponent was optimized, the H2 internuclear distance was varied from 7.416 x 10 to the -11th power to 7.673 x 10 to the -11th power m (1.401 to 1.450 bohrs). The intermolecular distance was varied from 1 to 4 bohrs (0.5292 to 2.117 x 10 to the 10th power). Linear, scalene, and isosceles configurations were used. A weighted average of the interaction energies was taken for each intermolecular distance. Although energies are tabulated, the principal purpose was to calculate the electric dipole moment and its derivative with respect to H2 internuclear distance.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TM-X-2839 , E-7342
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  • 63
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    List of technical reports and conferences on pion research (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Lists of the Ph.D. theses, publications, and talks given at professional meetings based on research in medium energy physics are presented.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-132280
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  • 64
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    The relativistic dynamics of a point charge in the field of a plane electromagnetic wave traveling in the direction of a uniform static magnetic field (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The motion of a charged particle in electromagnetic fields of various geometric configurations and arising from a variety of sources is of intrinsic interest in electromagnetic theory. The particular configuration consisting of a plane wave propagating in the presence of a static uniform magnetic field whose direction is parallel to the wave normal is examined. The analysis presented here is treated within the context of classical electromagnetic theory. A numerical solution - at least to the approximate Lorentz-Dirac equation - is obtained.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-132781
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  • 65
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    Scattering of 42 MeV alpha particles from copper-65 (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Beams of 42-MeV alpha particles were elastically and inelastically scattered from Cu-65 in an attempt to excite states which may be described in terms of an excited core model. Angular distributions were measured for 17 excited states. Seven of the excited states had angular distributions similar to a core quadrupole excitation and eight of the excited states had angular distributions similar to a core octupole excitation. The excited state at 2.858 MeV had an angular distribution which suggests that it may have results from the particle coupling to a two-phonon core state. An extended particle-core coupling calculation was performed and the predicted energy levels and reduced transition probabilities compared to the experimental data. The low lying levels are described quite well and the wavefunctions of these states explain the large spectroscopic factors measured in stripping reactions. For Cu-65 the coupling of the particle to the core is no larger weak as in the simpler model, and configuration mixing results.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TN-D-7354 , E-7404
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  • 66
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    Optical potential approach to the electron-atom impact ionization threshold problem (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The problem of the threshold law for electron-atom impact ionization is reconsidered as an extrapolation of inelastic cross sections through the ionization threshold. The cross sections are evaluated from a distorted wave matrix element, the final state of which describes the scattering from the Nth excited state of the target atom. The actual calculation is carried for the e-H system, and a model is introduced which is shown to preserve the essential properties of the problem while at the same time reducing the dimensionability of the Schrodinger equation. Nevertheless, the scattering equation is still very complex. It is dominated by the optical potential which is expanded in terms of eigen-spectrum of QHQ. It is shown by actual calculation that the lower eigenvalues of this spectrum descend below the relevant inelastic thresholds; it follows rigorously that the optical potential contains repulsive terms. Analytical solutions of the final state wave function are obtained with several approximations of the optical potential.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TM-X-66282 , X-641-73-195
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    Intermediate energy proton-deuteron elastic scattering (1973)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: A fully symmetrized multiple scattering series is considered for the description of proton-deuteron elastic scattering. An off-shell continuation of the experimentally known twobody amplitudes that retains the exchange symmeteries required for the calculation is presented. The one boson exchange terms of the two body amplitudes are evaluated exactly in this off-shell prescription. The first two terms of the multiple scattering series are calculated explicitly whereas multiple scattering effects are obtained as minimum variance estimates from the 146-MeV data of Postma and Wilson. The multiple scattering corrections indeed consist of low order partial waves as suggested by Sloan based on model studies with separable interactions. The Hamada-Johnston wave function is shown consistent with the data for internucleon distances greater than about 0.84 fm.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TN-D-7313 , L-8915
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  • 68
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    Collision quenching effects in nitrogen and helium excited by a 30-keV electron beam (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The quenching cross section for the 0-0 first negative band of nitrogen is determined for temperatures between 78 K and 300 K. As the temperature increases above 78 K, the quenching reaches a maximum at approximately 140 K and then decreases as 300 K is approached. At temperatures on the order of 5000 K, quenching is reported to increase with temperature and must therefore reach a minimum at some intermediate temperature between 300 K and 5000 K. By comparison, quenching of the 5016 A helium line increases continuously over the temperature range 78 K to 300 K.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TM-X-2842 , L-8017
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  • 69
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    Estimation of dipole-quadrupole dispersion energies. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The calculation of the dipole-quadrupole dispersion coefficient is discussed through a perturbation and a variation method. Accurate combination rules are obtained from both methods, one new and one already known. Further approximations permit computations in terms of accessible parameters. Values are calculated for the interactions of atomic pairs formed from hydrogen, alkali, and rare-gas atoms. A new relation giving the dipole-quadrupole coefficient in terms of the dipole-dipole coefficient and the dipole and quadrupole polarizabilities seems accurate, but needs further testing.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; July 1
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  • 70
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    On singlet s-wave electron-hydrogen scattering. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Discussion of various zeroth-order approximations to s-wave scattering of electrons by hydrogen atoms below the first excitation threshold. The formalism previously developed by the author (1967, 1968) is applied to Feshbach operators to derive integro-differential equations, with the optical-potential set equal to zero, for the singlet and triplet cases. Phase shifts of s-wave scattering are computed in the zeroth-order approximation of the Feshbach operator method and in the static-exchange approximation. It is found that the convergence of numerical computations is faster in the former approximation than in the latter.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Nuovo Cimento; vol. 6
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  • 71
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    Line intensities of CO2 in the 2.0 micron region. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer; 13; Apr. 197
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  • 72
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    Condensation in CO2 free jet expansions. II - Growth of small clusters. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An investigation into the kinetics of molecular clustering processes which occur in the highly supersaturated vapor of a CO2 free jet is described. Terminal cluster concentrations in expansions from room temperature and reservoir pressures in the range from 400 to 900 torr were determined for trimeric CO2 for nozzle diameters of .0076 cm, .015 cm, and .023 cm and in the case of CO2 tetramer and pentamer for .015 cm nozzle diameter. The measurements were made mass spectrometrically in a supersonic molecular beam apparatus. A kinetic analysis was developed from an extension of the critical nucleus concept of nucleation theory and rate equations based on intermolecular collisions. The observed cluster populations could be accounted for by the theory by adopting sticking probabilities of approximately .03 for monomer impinging on dimer, trimer, and tetramer.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Aug. 1
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  • 73
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    Condensation in CO2 free jet expansions. I - Dimer formation. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A theoretical and experimental investigation of the kinetics of CO2 dimer formation in the adiabatically expanding core of a free jet expansion has been carried out. The theoretical analysis is based on dimer formation by an efficient termolecular process and dimer destruction by bimolecular collisions. Account is taken of the expected variation of the specific heat ratio during the expansion and of the effective increase in the termolecular collision rate at low temperatures due to the presence of loosely bound orbiting pairs. Experimental dimer concentrations were measured mass spectrometrically by forming a molecular beam from the expanded gas mixture after the onset of molecular flow. Observed dimer concentrations, for a range of pre-expansion conditions of 400 to 900 torr pressure and room temperature, are in good agreement with the theoretical analysis, provided that account is taken of the effect of loosely bound orbiting pairs at low temperatures.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Aug. 1
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  • 74
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    3 nu sub 3 band of C-12H4 at 1.1 micron. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The 3 nu sub 3 absorption band of C-12H4 has been measured using a high-resolution vacuum infrared spectrometer. A technique is described which allows an extension of the use of the absorption standards available at 4.7 microns to the photomultiplier region of the spectrum. The new measurements indicate a shift of about 0.18 per cm from the most recently published measurements of this band.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; Aug. 1
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  • 75
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    Complete hydrogen and helium particle spectra from 30- to 60-MeV proton bombardment of nuclei with A = 12 to 209 and comparison with the intranuclear cascade model. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review C - Nuclear Physics; vol. 8
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  • 76
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    Detailed balance as a check on impact parameter calculations. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: It is demonstrated numerically that detailed balance indeed is well satisfied in the multi-state impact parameter formulation of proton-hydrogen atom collisions. It is also demonstrated numerically that detailed balance is a much more sensitive test of computational accuracy than is the charge conservation test usually employed in such impact parameter calculations. It is suggested that detailed balance be used as a check on all impact parameter calculations. That even agreement with detailed balance may not be a sufficient test for accuracy of the results is pointed out.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Physics; vol. 6
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  • 77
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    Nitrogen ionization in an Hg-N2 discharge. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; July 15
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  • 78
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    Equilibrium properties of a one-dimensional kinetic system. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: One-dimensional systems of N = 500 and 250 particles in equilibrium are numerically simulated utilizing the method of molecular dynamics. Periodic boundary conditions are imposed. The classical two-body interaction potential is short range, repulsive and has a corresponding finite force. The equations of state are determined for densities both less and greater than one. Corresponding theoretical isochores are determined from models based on nearest-neighbor interactions and on a truncated virial expansion, and a comparison is made with the experimental isochores. Time independent radial distributions are constructed numerically and discussed. A change of state from a solidlike state to a fluid-gas state based on the penetrability of the particles is predicted. The transition temperatures are estimated from the radial distribution functions and the nearest-neighbor model. Self-diffusion is observed and the corresponding constants are determined from the velocity autocorrelation functions.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 59; July 15
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  • 79
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    Theoretical assignments of the low-lying electronic states of carbon dioxide. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Chemical Physics Letters; 20; July 15
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  • 80
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    Optical coupling system for photon-photon coincidence experiments. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An efficient optical coupling system is presented that promises to be useful in experiments where it is necessary to collect a large fraction of emitted photons, as in photon-photon coincidence experiments. Narrow bandpass interference filters are an integral part of the proposed system.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Applied Optics; 12; Aug. 197
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  • 81
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    Low-energy positrons from metallic moderators in a back scattering mode. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Evaluation of preliminary results of the emission of slow (about 1 eV) positrons from solid moderators. The results presented are for copper, gold, and aluminum and were obtained using the backscatter mode of operation. Of the three metals investigated, copper is found to emit positrons with the lowest energy, while aluminum emits those with the highest energy. Several small peaks are noted on the high-energy side of the spectra, especially in the case of gold and aluminum.-
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physics Letters; 43A; Mar. 12
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  • 82
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    On the product rotational state distribution in exoergic atom-diatomic molecule reactions. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Chemical Physics Letters; 19; Mar. 1
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  • 83
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    Gyromagnetic ratio of a massive body. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: It is well known that the gyromagnetic ratio (g factor) of a classical, slowly rotating body whose charge density is proportional to its mass density must be equal to unity. However, if the body is very massive, the spacetime curvature effects of general relativity become important and the result g = 1 is no longer valid. We calculate here the gyromagnetic ratio of a slowly rotating, massive shell with uniform charge density. When the shell is large compared with the Schwarzschild radius we have g = 1, but as the shell becomes more massive the g factor increases. In the limit as the shell approaches its Schwarzschild radius we obtain g approaching 2 (the same value as for an electron).
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review D - Particles and Fields; vol. 7
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  • 84
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    Polarization of synchrotron radiation from relativistic Schwarzschild circular geodesics. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The pattern of geodesic synchrotron radiation emitted by a charge in an orbit close to the circular photon orbit at 3M around a nonrotating black hole of mass M is studied. The analysis is carried out using Stokes parameters, which completely characterize the state of the wave. The linear polarization, as observed at infinity, is total in the orbital plane and not smaller than 90% at the half-width of the beam. At the poles, pure circular polarization would be observed. In the region between the orbit plane and the poles the polarization shows features not present in ordinary synchrotron radiation. In our model, parameters more sensitive to deviations from the orbital plane are the Stokes parameter s (sub 2) and the tilt angle of the polarization ellipse.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review D - Particles and Fields; vol. 7
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  • 85
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    Gauge invariance, current conservation, and GIAO's. (1973)
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    Publication Date: 2019-06-27
    Description: The well-known relationship between gauge invariance and current conservation is exhibited within the usual quantum mechanical formalism. It is then shown that the use of Gauge Invariant Atomic Orbitals does not necessarily lead to the expected current conservation. The reason is found to lie in the constrained nature of the gauge invariance which is provided by the use of GIAO's. It is concluded that this invariance is, of itself, no argument in favor of their use.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 58; Feb. 15
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  • 86
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    Improved Hanle effect measurement technique for fast ions. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: An improved averaging technique for use with foil-excited fast ions is applied to a Hanle-effect measurement of the mean life of some fast ions. With improved data analysis, the employed technique is expected to be more precise, as well as experimentally simpler than previously used techniques.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physics Letters; 43A; Feb. 26
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  • 87
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    Curve crossing for low-energy elastic scattering of He/+/ by Ne. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The perturbation seen in the experimental differential elastic-scattering cross section for the 40-eV He/+/ + Ne system has been attributed to a single crossing of two intermolecular potential-energy curves. A new theoretical treatment of the curve-crossing problem, namely, that of Delos and Thorson, is employed to obtain the crossing probabilities and phases associated with the crossing. These are determined by utilizing ab initio potentials involved in the crossing and are further used in a partial-wave calculation of the cross section, which is compared with our experiment. The origin of the oscillatory structure observed in the differential cross section is discussed in semiclassical terms by defining the problem in terms of two pseudo-deflection-functions. A rainbow effect is shown to be related to a particular feature (a maximum rather than a minimum) of these deflection functions.
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  • 88
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    In situ sputter cleaning of thin film metal substrates for UHV-TEM corrosion studies. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A prerequisite for conducting valid corrosion experiments by in situ electron microscopy techniques is not only the achievement of UHV background pressure conditions at the site of the specimen but also the ability to clean the surface of the thin metal substrate specimen before initiation of the corrosive interaction. A miniaturized simple ion gun has been constructed for this purpose. The gun is small enough to be incorporated into an UHV electron microscope specimen chamber with hot stage in such a way as to permit bombardment of the substrate specimen while observing it by transmission electron microscopy TEM. It is shown that the ion beam generated is confined well enough to cause a sputtering removal of substrate material at a rate of approximately 5-10 A/min and to prevent the sputter deposition of contaminating material from the specimen holder.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
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  • 89
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    Interaction lengths of energetic pions and protons in iron. (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Determination of the mean interaction lengths for 9.3-, 13.8-, and 17.8-GeV protons and 9.3- and 17.8-GeV positive pions in iron. The mean interaction length of pions is found to be approximately 20% greater than that of protons. No statistically significant variation of the mean interaction length for protons or pions as a function of energy is observed. With only two exceptions, the data obtained show a systematic 5% difference between measurements of the mean interaction length made with cosmic rays and those made with accelerator-produced protons.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physical Review D - Particles and Fields; vol. 7
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  • 90
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    A lower limit to the altitude of coronal particle storage regions deduced from solar proton energy spectra (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The spectrum of low energy protons observed at 1 AU following solar flares shows little or no evidence of energy degradation down to approximately 0.3 MeV. Such observations may be used to set a lower limit on the altitude of hypothetical coronal particle storage regions, ranging from 2 to 7 R sub s. It is pointed out that closed coronal magnetic loop structures are observed to extend to 2R sub s, so that long-term storage of low energy protons does not take place in the immediate vicinity of the sun. It is further suggested that in the few cases where the proton spectrum appears to be degraded at low energies, the energy loss may be due to adiabatic deceleration in the expanding solar wind. The alternative of continual acceleration is suggested as a plausible substitute for the particle storage hypothesis.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA, Washington High Energy Phenomena on the Sun; p 478-485
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  • 91
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    Coronal magnetic fields and energetic particles (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An examination was made of magnetic field effects in coronal and interplanetary space on propagation and storage of energetic particles from the flare site to 1 AU. Attempts were made to determine how several characteristics of solar energetic particle emissions are influenced by detailed configuration of the corona magnetic fields below 2.5 solar radii. Solar energetic particles are followed in the ambient magnetic field from injection above a flare until they either: (1) impact on the photosphere, (2) escape into interplanetary space, or (3) mirrow at some distant location in the corona.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA, Washington High Energy Phenomena on the Sun; p 453-477
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  • 92
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    Solar flare accelerated isotopes of hydrogen and helium (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Measurements of solar flare hydrogen, deuterium, tritium, helium-3, and helium-4 in the energy range approximately 10 to 50 MeV per nucleon obtained with instrumentation on the IMP-4 and IMP-5 satellites are reported and studies based on these results which place several constraints on theories of solar flare particle acceleration are discussed. A brief review of previous work and the difficulties in studying the rare isotopes of hydrogen and helium is also included. Particular emphasis is placed on the fact that the information to be obtained from the solar flare products of high energy interactions is not available through either solar wind observations where both the acceleration mechanism and the coronal source of the nuclear species are different, or optical measurements of solar active regions.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA, Washington High Energy Phenomena on the Sun; p 315-340
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  • 93
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    The isotopes of H and He in solar cosmic rays (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The isotopic composition of H and He in solar cosmic rays was studied with the solar galactic cosmic ray experiment on the Orbiting Geophysical Observatory, OGO-6. Averaging over 20 days of data from seven flare events during 1969, the ratios He-3/-He-4 = 0.10 + or - 0.02, D/H (76) .0003 and T/H (76) .0001 in the 4 to 5 MeV/nucleon energy range were obtained. In addition, large variations were found in the relative abundance of He-3 from event of event, with a maximum ratio of He-3/He-4 = 0.26 + or - 0.08 observed on October 14 and 15, 1969. The relative abundance of He-3 and D during this event does not seem to be consistent with existing calculations of the nuclear interaction orgin of these isotopes.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NSSDC-ID-69-051A-20-PM , NASA, Washington High Energy Phenomena on the Sun; p 341-354
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  • 94
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    Research program in nuclear and solid state physics (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The spectra of prompt gamma rays emitted following nuclear pion absorption were studied to determine the states of excited daughter nuclei, and the branching ratios for these states. Studies discussed include the negative pion absorption of C-12, S-32, and N-14; and the positive pion absorption on 0-16. Abstracts of papers submitted to the conference of the American Physical Society are included.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-131398
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  • 95
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    Ionization processes in mercury discharges (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A summary of theoretical calculations of the ionization processes in mercury plasma is presented. Various possible ionization processes are analyzed and discussed. It is found that the ionization due to excited state interactions is dominant when the degree of ionization is small and that the ionization due to multistep electron impact is significant when the degree of ionization is high.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-130924 , JPL-TM-33-596
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  • 96
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    Measurements of recombination of electrons with HCO(plus) ions (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Recombination coefficients of electrons with HCO(+) ions were determined with a microwave afterglow/mass spectrometer apparatus. Afterglow measurements of electron density decays in neon-hydrogen-carbon monoxide mixtures are correlated with the decay of mass-identified ion currents to the wall of the microwave cavity. At the appropriate partial pressures of hydrogen and carbon monoxide in the mixture, the ion HCO(+) dominates the ion composition and its wall current approximately tracks the electron density decay curve. From recombination controlled electron density decay curves, the values alpha (HCO(+)) = (3.3 + or - 0.5) and (2.0 + or - 0.3) 0.0000001 cu cm/sec are obtained at 205 and 300 K, respectively. The implications of these results for models of polyatomic molecule formation in dense interstellar clouds are briefly discussed.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-131107 , SRCC-185
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  • 97
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    Drag coefficients for spheres in free molecular flow in O at satellite velocities (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The drag coefficients for the Echo 1 and Explorer 24 spherical surfaces in an O environment were experimentally determined over an energy range of 4 to 200 eV. The experiment was performed by generating a beam of atomic oxygen ions of the proper energy, neutralizing a portion of the beam, and then allowing only the neutral O particles to strike a very sensitive torsion balance. The momentum transferred to the surface was determined from the deflection of the torsion balance. At the lower energies, the more intense ion beam had to be used instead of the neutral beam. The drag coefficients are found to be slightly greater than 2 at energies corresponding to satellite velocities.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-CR-2233
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  • 98
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    Ion streaming instabilities with application to collisionless shock wave structure (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The electromagnetic dispersion relation for two counterstreaming ion beams of arbitrary relative strength flowing parallel to a dc magnetic field is derived. The beams flow through a stationary electron background and the dispersion relation in the fluid approximation is unaffected by the electron thermal pressure. Magnetic effects on the ion beams are included, but the electrons are treated as a magnetized fluid. The dispersion relation is solved with a zero net current condition applied and the regions of instability in the k-U space (U is the relative velocity between the two ion beams) are presented. These results are extensions of Kovner's analysis for weak beams. The parameters are then chosen to be applicable for parallel shocks. It is found that unstable waves with zero group velocity in the shock frame can exist near the leading edge of the shock for upstream Alfven Mach numbers greater than 5.5.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physics of Fluids; 16; Dec. 197
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  • 99
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    Turbulence in electrostatic ion-acoustic shocks (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Three types of collisionless electrostatic ion-acoustic shocks are investigated using the University of California, Los Angeles, double plasma device: (1) laminar shocks; (2) small amplitude turbulent shocks in which the turbulence is confined to be upstream of the shock potential jump; and (3) large amplitude turbulent shocks in which the wave turbulence occurs throughout the shock transition. The wave turbulence is generated by ions which are reflected from the shock potential; linear theory spatial growth increments agree with experimental values. The experimental relationship between the shock Mach number and the shock potential is shown to be inconsistent with theoretical shock models which assume that the electrons are isothermal. Theoretical calculations which assume a trapped electron equation of a state and a turbulently flattened velocity distribution function for the reflected ions yields a Mach number vs potential relationship in agreement with experiment.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Physics of Fluids; 16; Dec. 197
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  • 100
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    Electron impact excitation and assignment of the low-lying electronic states of N2O (1973)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Electron scattering spectra of nitrous oxide are reported in the 5- to 10-eV energy-loss range at scattering angles of 20, 30, 90, and 130 deg at a residual energy of 7.0 eV; and at residual energies of 10.0, 2.0, 1.0, 0.6, and 0.2 eV at a scattering angle of 90 deg. Several new distinct and overlapping continua are observed to lie in this energy-loss range. The experimental spectra are discussed in the light of semiempirical INDO calculations of Chutjian and Segal (1972) of the vertical transition energies of N2O. An assignment of the symmetries of the observed excitations consistent with the experimental and theoretical data is suggested.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Physics; vol. 6
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