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  • Articles  (28)
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  • Springer  (12)
  • American Institute of Physics (AIP)  (8)
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  • 2015-2019
  • 2010-2014
  • 1990-1994  (20)
  • 1985-1989
  • 1980-1984  (8)
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  • Physics  (24)
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  • Articles  (28)
  • Other Sources
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  • 2015-2019
  • 2010-2014
  • 1990-1994  (20)
  • 1985-1989
  • 1980-1984  (8)
Year
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  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopy of methylene: Einstein coefficients for CH2(b˜ 1B1–a˜ 1A1) transitions (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 6429-6435 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The b˜ 1B1→a˜ 1A1 emission spectrum of the CH2 radical has been studied in the 13 330–18 180 cm−1 region. Methylene (a˜ 1A1) is produced by photolysis of ketene at 308 nm and excited to single rovibrational levels of the b˜ 1B1 state by a tunable pulsed dye laser. The emission from the b˜ 1B1 state is spectrally dispersed with a resolution of 0.25 A(ring). Term values and transitions are reported for new levels of the b˜ 1B1(0,v2,0) (v2=14 and 15) and a˜ 1A1(0,0,0) states with J≥6 and 0≤Ka≤6. Unusually intense ΔKa=3 transitions and several ΔKa=5 transitions are observed. Analysis of the emission spectra gives the relative intensities of transitions from a selected rovibrational level in the upper b˜ 1B1 state to rovibrational levels in the a˜ 1A1 state. These relative intensities together with the fluorescence lifetimes of the b˜ 1B1 levels determine the absolute Einstein emission coefficients for rovibronic transitions in the visible spectrum of methylene. These data permit accurate measurement of rovibrational state populations for CH2(a˜ 1A1) by laser-induced fluorescence spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465882
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  • 2
    Electronic Resource
    Electronic Resource
    A refined Monte Carlo study of aqueous urea solutions (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 9122-9134 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In a Monte Carlo study several concentrations of urea in water were studied with a potential that includes polarization and nonadditive effects in the intermolecular interaction. Very long runs, 20×106 steps, were used to assure that equilibrium was attained. The results obtained reproduce experimental data, in particular the nitrogen and hydrogen centered radial distribution functions, validating the model and also allowing for the assignment of the structure of this function. We can also address the phenomena of the dimerization of urea and the urea water correlation. Energetic and structural analysis show that there is a urea network which has a particular effect on water structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465527
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of nonpolar solvents on Rydberg states: van der Waals complexes of azabicyclooctanes (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 6769-6778 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effect of solvation by nonpolar solvents on the (n,3s) Rydberg states of 1,4-diazabicyclo[2.2.2]octane (DABCO) and azabicyclo[2.2.2]octane (ABCO) is investigated through mass resolved excitation spectroscopy of their van der Waals complexes. The solute/solvent clusters formed in a supersonic expansion include DABCO and ABCO with Ar, n-CmH2m+2 (m=1–7), and CF4 and C2F6. The resulting spectra are analyzed with the help of empirical potential energy calculations of the cluster binding energies, minimum energy structures, van der Waals modes, and potential barriers between the various cluster minimum energy structures. Good agreement is found between the calculated and experimental results for DABCO and ABCO clustered with argon and methane. The spectra of clusters with all other hydrocarbons can be ascribed to only one major geometry for each cluster stoichiometry, despite the fact that calculations yield many stable geometries for each cluster. This apparent lack of agreement between calculations and experiments can be rationalized based on cluster binding energy, zero point energy, and the potential energy barriers between the cluster minima. The observed blue shift of the cluster 000 transition energy as a function of the n-alkane chain length can be qualitatively modeled by a Lennard-Jones potential for the solute–solvent interaction for both the ground and excited states. The model reveals a strong repulsive interaction between the Rydberg state electronic distribution and the solvent molecule. This repulsion depends on the distance between the solvent molecule and the solute molecule nitrogen atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464769
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  • 4
    Electronic Resource
    Electronic Resource
    Solvation effects on the molecular 3s Rydberg state: AZAB/CYCLO octanes clustered with argon (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 1876-1887 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Two color, 1+1, mass resolved excitation spectroscopy (MRES) is used to obtain molecular Rydberg (3s←n) spectra of azabicyclo[2.2.2]octane (ABCO) and diazabicyclo[2.2.2]octane (DABCO) clustered with argon. Nozzle/laser timing delay studies are employed together with time-of-flight mass spectroscopy to identify cluster composition. Population depletion techniques are used to differentiate between clusters with the same mass, but different geometries. A Lennard-Jones 6–12 potential is used to model the intermolecular interactions and predict minimum energy cluster geometries and cluster binding energies. The experimental results are combined with the cluster geometry calculations to assign spectral features to specific cluster geometries. Three different excited state interactions are required to model the experimentally observed line shapes, spectral shifts, and cluster dissociation. The relationship between these model potentials and the cluster binding sites suggests that the form of the cluster intermolecular potential in the Rydberg excited state is dictated by the distance between the argon and chromophore atoms. A comparison of results for ABCO(Ar)1 and DABCO(Ar)1 leads to the conclusion that the nitrogen 3s Rydberg orbital in clusters of DABCO is delocalized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464222
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  • 5
    Electronic Resource
    Electronic Resource
    (n,3s) Rydberg spectra of diethyl ether, diisopropyl ether, and methyl vinyl ether: Analysis of the torsional motion (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 3703-3712 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Two-photon resonance mass resolved excitation spectra are obtained for diethyl ether-h10, diethyl ether-d10, diisopropyl either, and methyl vinyl ether cooled in a supersonic jet expansion. The spectra are assigned as due to 2p3s←(2p)2 Rydberg excitations: significant progressions in a low energy vibrational mode are observed for both diethyl and diisopropyl ethers, but not for methyl vinyl ether. The transition energies for the vibronic progressions are modeled by a double well potential function of polynomial form truncated at the quartic term. The transition intensities for the progressions are calculated based on a Franck–Condon analysis of the excited state potential surface and a harmonic ground state surface. Calculations identify the progression forming mode as the antigeared torsion of the C–O–C–C dihedral angles. Excitation of diethyl ether from its ground electronic state to its 2p3s Rydberg state leads to changes in the dihedral angles (τ1, τ2) from ±180° to ±157°. Similar electronic excitation of diisopropyl ether yields changes in (τ1,τ2) from ±157° in the ground state to ±146° in the Rydberg state. The torsional displacement active in the 2p3s←(2p)2 oxygen Rydberg transition is suggested to arise from the interaction between the diffuse 3s electron and the β-methyl groups on both diethyl and diisopropyl ethers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464047
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  • 6
    Electronic Resource
    Electronic Resource
    Optical design of a fast multiframe holographic interferometry system for transient plasma diagnostics (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3330-3331 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design of a fast multiframe holographic interferometry system for rapidly evolving transparent objects is described. Essential elements to the configuration are a multipulse laser, an electro-optic deflector (EOD), and a concave spherical mirror. The hologram, EOD and concave mirror are in a circle whose radius is the same as the spherical mirror. The different frames are superimposed on the same area of the hologram. On reconstruction separation of multiple images is achieved on the Fourier plane of a lens which is used to image the reconstruction of the hologram. The total number of optical components is kept to a minimum and only two of these are used in transmission. Due to the low component count the quality of interferograms obtained is very high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144300
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental studies of ionization processes in the breakdown phase of a transient hollow cathode discharge (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 2750-2752 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ionization process in the prebreakdown phase of a transient hollow cathode discharge (THCD) is investigated. The discharge is operated in H2 and N2 at pressures between 30 and 750 mTorr with applied voltages up to 30 kV. A capacitive probe array is used to measure the spatial and temporal evolution of plasma formation in the interelectrode spacing. The results obtained are consistent with the formation of a moving virtual anode. The growth and evolution of the virtual anode are closely linked to the formation of electron beams emitted from the hollow cathode region before and at the time of electric breakdown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110323
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  • 8
    Electronic Resource
    Electronic Resource
    Radiative lifetimes of CH2(b 1B1) (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 873-882 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Radiative lifetimes are reported for CH2(b 1B1) in a wide range of rotational states in the (0,14,0), (0,15,0), (0,16,0), and (0,17,0) vibrational levels. Laser photolysis of ketene in a supersonic-jet expansion produced CH2(a 1A1) which was excited to single rovibrational levels of the (b 1B1) state by a second laser. Analysis of the temporal evolution of the fluorescence (b 1B1)–(a 1A1) yielded collision-free radiative lifetimes for the (b 1B1) state. The measured lifetimes range from about 4 to 10 μs and decrease with increasing vibrational energy. For the (0,14,0) overtone, the lifetimes increase slightly as a function of J (Ka=0). However, the lifetimes of rotational levels with Ka=0 in the (0,16,0) vibrational state are found to be independent of the rotational state. Calculations of the vibronic lifetimes show that the considerable lifetime lengthening when Ka≥1 is due to Renner–Teller coupling to the a˜ 1A1 state. The random lifetime fluctuation observed in some vibronic bands is probably due to spin–orbit coupling to the X˜ 3B1 state, e.g., 413 and 414 of (0,15,0). Here the radiative lifetime of the singlet component is shorter than that of the corresponding triplet component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464252
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  • 9
    Electronic Resource
    Electronic Resource
    A qualitative mathematical model of the ontogeny of a circadian rhythm in crayfish (1993)
    Springer
    Bulletin of mathematical biology 55 (1993), S. 97-110 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Based on experimental work on the ontogeny of the electroretinogram circadian rhythm in crayfish, we present a mathematical model simulating changes in both frequency and amplitude of the electroretinogram oscillation during several developmental stages until shortly before the adult age. Simultaneously, we propose a hypothetical oscillation in the hormonal release whose frequency is imposed on the electroretinogram oscillation. The model consists of two coupled nonlinear oscillators in which a dynamical response is obtained mainly through an Andronov-Hopf bifurcation. Through the construction of the model, a biological hypothesis about the essential elements underlying the ERG circadian rhythm and their interrelations is formulated and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460296
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  • 10
    Electronic Resource
    Electronic Resource
    The kinetics of enzyme systems involving activation of zymogens (1993)
    Springer
    Bulletin of mathematical biology 55 (1993), S. 561-583 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract A general model of zymogen activation is proposed and explicit kinetic equations for the time courses of the various species and products involved are given. These equations are valid for the whole course of the reaction and therefore for both the transient phase and the steady state. This model is sufficiently general to include mechanisms possessing one or more steps of zymogen activation besides possible steps of inhibition (reversible or irreversible) or inactivation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460651
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