Abstract
The concentration dependence of vibrational linewidths in isotopic mixtures has been utilized routinely to ascertain the role of resonant energy transfer on vibrational relaxation in liquids. In a Raman study of the v 1 modes in CH 2Cl 2/CD 2Cl 2 solutions, it was found that the C-H stretching linewidth actually increases upon isotope dilution. This result, predicted theoretically but never heretofore observed, contains significant ramifications concerning the interpretation of isotopic dilution studies in general.
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