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  • 1
    Electronic Resource
    Electronic Resource
    Theoretical and experimental investigation of pressure broadening and line shift of carbon monoxide in collision with hydrogen between 8 and 600 K (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 4069-4075 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured pressure broadening and line shift parameters for the J=1←0 and J=2←1 transitions of carbon monoxide (CO) in collision with hydrogen (H2) at various temperatures between 8 and 600 K. Because of the abundance of both species in the interstellar medium, the CO–H2 collision system is of astrophysical importance. Measurements below 35 K were made using the collisional cooling technique, while measurements at higher temperatures were made in a conventional equilibrium cell. These measurements were compared with theoretical results of quantum scattering calculations using the currently best available potential surface for the CO–H2 collision system. We find a good agreement between theory and experiment at higher temperatures (〉30 K) while for lower temperatures considerable deviations occur. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480956
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    FTIR Spectroscopy of Solid Parahydrogen in the NIR/VIS Region (1998)
    Springer
    Journal of low temperature physics 111 (1998), S. 757-762 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the results of FTIR measurements of solid parahydrogen at 12.5 K in the spectral region 9 000 – 16 500 cm −1 using an internal multireflection cell with 14 cm optical path length. We find several new ro–vibrational transitions such as the single transition W 2(0) at 10241.07 cm −1 and double transitions among which we consider the most interesting ones to be Q 2 (0) + Q 1 (0), due to its unexplained induction mechanism, and Q 2 (0) + S 1 (0) due to its fine structure, revealing non–resonant hopping of rotational excitations. Furthermore we find absorption features at 8650–8670 cm −1 and at 8980–9000 cm −1 which we interpret as the triple transitions Q 1 (0) + Q 1 (0) + S 0 (0) and S 1 (0) + Q 1 (0) + S 0 (0), which acquire intensity from nearby double transitions. At 12 788 cm −1 we find the triple transition S 1 (0) + Q 1 (0) + Q 1 (0).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022286509222
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    Paper (German National Licenses)
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