Abstract
A study of vibrational energy transfer for four aromatics with the collision partners Hz and He has been undertaken to assess the role of V → R transfer when a low moment of inertia collision partner is involved. Significant transfer occurs to 0° (the only channel for which V → R transfer can occur) in relaxation of benzene and benzene- d 6 by H 2, but not by He. For both p-difluorobenzene and toluene there is significant transfer to 0° by both He and H 2, preventing the observation of V → R transfer in these polyatomics. It is found that He adopts different pathways when heavy groups are attached to the ring. H 2 is more consistent in its preferences.
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