The time scale for solvent ''caging'' in the classic I2 photodissociation reaction appears to be ≤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.
ASJC Scopus subject areas
- Physics and Astronomy(all)