Abstract
The time scale for solvent ``caging'' in the classic ${\mathrm{I}}_{2}$ photodissociation reaction appears to be \ensuremath{\le}15 ps, on the basis of examination of new picosecond absorption spectra. The previously observed slow recovery (>100 ps) of molecular absorption is shown to be due to both ground-state vibrational relaxation and excited-state trapping in the recombined molecule. In addition, newly observed absorptions in the 350--400-nm region provide direct information on solvent-induced predissociation and excited-state vibrational relaxation.
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