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  • 1
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    Analytical formulae for the inverse bremsstrahlung absorption coefficient (1974)
    Institute of Physics
    Details
    Publication Date: 1974-12-01
    Print ISSN: 0032-1028
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
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    N(+)-N and O(+)-O interaction energies, dipole transition moments, and transport cross sections (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Complete sets of ion-atom interaction energies have been computed for nitrogen and oxygen with accurate large scale structure calculations. The computed energies agree well with the accurate potential curves available from spectroscopic measurement. The state functions from the nitrogen calculations have been applied to determine the transition moment for all allowed dipole transitions. These results can be combined to compute a detailed radiation spectrum such as that required to define the highly nonequilibrium environment of aeroassisted orbital transfer vehicle (AOTV). The long-range interaction energies have been used to determine the ion-atom resonance charge exchange cross sections that are important for transport processes such as diffusion. A calculation to determine reliable transport properties for energies that include the AOTV temperature range from these computed properties is described.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
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    NASA TECHNICAL REPORTS
  • 3
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    Semiclassical vibration-rotation transition probabilities for motion in molecular state averaged potentials. (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Collision-induced vibration-rotation transition probabilities are calculated from a semiclassical three-dimensional model, in which the collision trajectory is determined by the classical motion in the interaction potential that is averaged over the molecular rotational state, and compared with those for which the motion is governed by a spherically averaged potential. For molecules that are in highly excited rotational states, thus dominating the vibrational relaxation rate at high temperature, it is found that the transition probability for rotational state averaging is smaller than that for spherical averaging. For typical collisions, the transition cross section is decreased by a factor of about 1.5 to 2.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Chemical Physics Letters; 12; Dec. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    N2/plus/ potential-energy curves (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Molecular nitrogen ion potential energy curves based on valence bond method, calculating sextet and quartet states at intermediate internuclear separation distances
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: ; IENCES (
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    NASA TECHNICAL REPORTS
  • 5
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    Absorption of laser radiation in a H-He plasma. I - Theoretical calculation of the absorption coefficient (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The theory for calculating the absorption of laser radiation by hydrogen is outlined for the temperatures and pressures of common laboratory plasmas. Nonhydrogenic corrections for determining the absorption by helium are also included. The coefficients for the absorption of He-Ne laser radiation at the wavelengths of 0.633, 1.15, and 3.39 microns in a H plasma is presented for temperatures in the range from 10,000 to 40,000 K and electron number densities in the range from 10 to the 15th power to 10 to the 18th power per cu cm. The total absorption of a H-He plasma calculated from this theory is compared with the measured absorption. The theoretical composition of the H-He absorption is analyzed with respect to the significant absorption processes, inverse bremsstrahlung, photoionization, resonance excitation, and photodetachment.
    Keywords: PHYSICS, PLASMA
    Type: Physics of Fluids; 17; Apr. 197
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    NASA TECHNICAL REPORTS
  • 6
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    Absorption of laser radiation in a H-He plasma. II - Experimental measurement of the absorption coefficient (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The absorption coefficients of 0.633-, 1.15-, and 3.39-micron laser radiation for a homogeneous H-He plasma have been measured in the temperature range from 12.2 to 21.7 (x 1000 K) and in the electron number density range 0.45 to 6.5 (x 10 to the 17th power per cu cm). Good agreement is found between the experimentally determined total absorption for each of the wavelengths and that calculated from theory. Furthermore, because the 3.39-micron absorption is dominated by inverse bremsstrahlung, while the 0.633-micron absorption is dominated by photoionization and resonance absorption, the experiment indicates a correct assessment by the theory of these individual absorption mechanisms.
    Keywords: PHYSICS, PLASMA
    Type: Physics of Fluids; 17; Apr. 197
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    NASA TECHNICAL REPORTS
  • 7
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    Absorption coefficients of a hydrogen plasma for laser radiation (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The formalism for the calculation of the absorption of radiation by a hydrogen plasma at common laboratory conditions is summarized. The hydrogen plasma absorption coefficient for laser radiation has been computed for a wide range of electron densities and temperatures (10,000-40,000 K). The results of this computation are presented in a graphical form that permits a determination of the absorption coefficient for the following laser wavelengths: 0.176, 0.325, 0.337, 0.442, 0.488, 0.515, 0.633, 0.694, 1.06, 1.15, 2.36, 3.39, 5.40 and 10.6 microns. The application of these results and laser radiation absorption measurements to plasma diagnostics is discussed briefly.
    Keywords: PHYSICS, PLASMA
    Type: Journal of Plasma Physics; 11; Feb. 197
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    NASA TECHNICAL REPORTS
  • 8
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    N2(+) bound quartet and sextet state potential energy curves (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The N2(+) potential energies have been determined from a complete active space self-consistent field calculation with active 2s and 2p electrons. A (6s 4p 3d 1f) Gaussian basis set was used together with additional higher angular momentum and diffuse functions. The calculated potential energy curves for the states 4Sigma(mu)(+), 4Pi(g), and 6Sigma(g)(+), for which there are no spectroscopic observations, are presented. The corresponding spectroscopic constants have been determined from a polynomial curve fit to the computed energies near the well minima and are shown. The 6Sigma(g)(+) state is found to be significantly bound, with a minimum at 1.72 A.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 33; 653-655
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    NASA TECHNICAL REPORTS
  • 9
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    Inelastic scattering in atom-diatomic molecule collisions. II - Effect of rotation on vibrational transition (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Rotational and vibrational transitions in a diatomic molecule caused by collisions with an atom are analyzed by a semiclassical method for conditions where the rotational transitions can be handled well by the sudden approximation and the vibrational transitions belong to the adiabatic regime. The contribution to the vibrational transition probability from the correction, which takes the finite value of the spacing between rotational energy levels into account, is examined.-
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 62; Jan. 15
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    NASA TECHNICAL REPORTS
  • 10
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    Corrections to vibrational transition probabilities calculated from a three-dimensional model. (1972)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Corrections to the collision-induced vibration transition probability calculated by Hansen and Pearson from a three-dimensional semiclassical model are examined. These corrections come from the retention of higher order terms in the expansion of the interaction potential and the use of the actual value of the deflection angle in the calculation of the transition probability. It is found that the contribution to the transition cross section from previously neglected potential terms can be significant for short range potentials and for the large relative collision velocities encountered at high temperatures. The correction to the transition cross section obtained from the use of actual deflection angles will not be appreciable unless the change in the rotational quantum number is large.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Journal of Chemical Physics; 55; May 1
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    NASA TECHNICAL REPORTS
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