Ligh-induced drift of ethylene (C₂{H}₄$) molecules upon rovibrational excitation is found to exhibit anomalous behavior as a function of the frequency detuning. This behavior, which shows a strong dependence on the rotational sublevels involved, has been investigated experimentally for C₂{H}₄$ immersed in Kr. For a qualitative explanation of these results a model is proposed that contains transport collision rates dependent not only on molecular vibration but also on molecular rotation.
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Chapovsky et al. (1992) studied this question.
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