Abstract
Absolute Raman cross-sections are reported for fourteen normal modes of betaine-30 dye in CH 3OH, CH 3OD, and CD 3OD solution, at five different excitation frequencies within the visible absorption band. Consistent with previous results from our lab, the Raman intensities of betaine-30 in CD 3OD solution are generally stronger than in CH 3OH solution. For most of the betaine-30 normal modes, however, the resonance Raman cross-sections are similar in CH 3OD and CH 3OH solution. The results suggest that methyl group motion, more so than hydroxyl group motion, is responsible for dephasing of the resonant electronic transition of betaine-30 in methanol.
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