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    Digitale Medien
    Digitale Medien
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 9549-9559 
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The effect of rotationally inelastic collisions on the orientation of the angular momentum is investigated for C2H2 (ν2=1, j). The orientation of the angular momentum in initial rotational states ji=7 to 13 is prepared by stimulated Raman pumping using circularly polarized light and S-branch transitions. After allowing an appropriate time for collisions to occur the orientation is probed by laser-induced fluorescence in the A˜ 1Au←X˜ 1Σg transition. For acetylene the theoretically calculated and the measured initial orientation, A0(1), ranges between 0.7 and 0.9. A substantial part of the orientation is conserved in rotationally inelastic collisions, which could be measured up to |Δj|=6 with sufficient signal-to-noise ratio. These results are compared with previous measurements on the conservation of alignment in collisions. Rotationally inelastic collisions with |Δj|=2 result in an average rotation of the orientation vector by about 30°. The amount of orientation that remains after a rotationally inelastic collision is found to depend primarily on |Δj|. A Δmj=0 propensity rule often used in models of rotational energy transfer is found to be inconsistent with the measurements. Also a model which proposes a minimum change of the classical angle φ between j(vector) and the quantization axis does not reproduce well the experimental data. Finally, a microscopic model for Δmj-transitions is presented which reconciles both alignment and orientation measurements. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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