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  • 1
    Electronic Resource
    Electronic Resource
    Quantum scattering calculations for H2S–He between 1–600 K in comparison with pressure broadening, shift, and time resolved double resonance experiments (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 8893-8903 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have performed quantum scattering calculations to predict pressure broadening, pressure shift, and inelastic depopulation cross-sections for the rotational transitions 11,0←10,1 and 22,0←21,1 of the H2S molecule in collision with helium atoms over a temperature range from 1 to 600 K. The calculated cross-sections are compared with experimental values obtained by millimeter wave spectroscopic techniques and the collisional cooling method. We observe good agreement between theory and experiment over the temperature region from 20 to 600 K, but increasing differences below 20 K. Possible reasons for the deviations at lower temperatures are discussed. The calculations also illustrate the contribution of elastic collisions to the pressure broadening cross-sections. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480234
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  • 2
    Electronic Resource
    Electronic Resource
    Rotational state dependence of collision induced line broadening and shift at low temperature (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 2087-2098 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dependence on rotational state of the pressure broadening and shift cross sections of the H2S–H2 and H2S–He systems is reported. The 110–101 and 211–202 transitions of H2S were studied over the temperature range 1–600 K, which includes both the low temperature quantal and the ambient semiclassical collision regimes. At low temperature collisions are mediated by the resonant formation of quasibound complexes rather than the more familiar "action-at-a-distance" mechanisms characteristic of ambient collisions. Additionally, because internal excitation of rotational states can play an important role in the formation of weakly bound complexes, the relation between the rotational energy level spacing hν, and the relative kinetic energy kT plays an important role. The low temperature regime is of interest both because of the interaction mechanism and because it is the regime characteristic of the interstellar medium. Qualitatively, the most interesting features were observed at low temperature, where significantly larger (∼×2) pressure broadening cross sections were measured for the 110–101 than for 211–202. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477818
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    Paper (German National Licenses)
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