Solvent-aided intramolecular energy

Figure 11.13 Time-resolved pump-probe vibrational relaxation of a C—H stretch vibration in liquid acetonitrile at room temperature detected by (Raman) emission from the excited state. In the isolated molecule such a v = 1 stretch mode will relax on the nanosecond time scale. The experiment maps out the energy transfer pathways in the liquid. The essential point is that the relaxation is by solvent-aided intramolecular transfer, as discussed in the text and indicated by arrows. Energy dumping into the liquid is far slower, requiring about 260ps (adapted from Deak etal. (1998) see also Iwaki and DIott (2001), Wang eta/. (2002)).

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