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  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    State-to-state ozone relaxation rates for O3–N2 collisions (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 6495-6505 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: State-to-state relaxation rates have been determined for ozone in collisions with itself and with nitrogen by two different methods. A theoretical model of collisional broadening of ozone lines, the quantum Fourier transform theory with improved dynamics, was adapted to compute state-to-state inelastic contributions to the pressure-broadened halfwidths for ozone–nitrogen collisions. These quantities were then determined experimentally using time-resolved infrared double resonance spectroscopy and a kinetic model for relaxation. Comparisons of kinetic model simulations and experimental double-resonance signals confirmed a propensity for first-order dipolar transitions, but also clearly demonstrated the importance of higher-order interactions leading to large changes in J in single collisions. Simple energy and angular-momentum-scaling laws were found to be inadequate to represent the experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465841
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pressure-induced widths and shifts for the ν3 band of methane (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 9412-9421 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Widths and shifts of methane lines perturbed by nitrogen are calculated using a complex-valued implementation of Robert–Bonamy (RB) theory. The static intermolecular potential is described as a sum of electrostatic forces and Lennard-Jones (6-12) atom–atom terms, using literature values for all physical parameters. Vibrational dependence of the isotropic potential is obtained from the polarizability of methane assuming a dispersion interaction. The repulsive part of the Lennard-Jones accounts for the greatest part of widths, while dispersion interactions are largely responsible for shifts. Although the average error between calculated and observed linewidths (up to J=8) is less than 6%, their distribution suggests the influence of interactions not described in the present theory. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467972
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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