Femtosecond Photo-induced Dissociation of the Trihalide Anions I_3~- and I_2 Br~- in Solution

摘要

The photo-induced dissociation of the trihalide anions I_3~- and I_2Br~- in methanol and acetonitrile solution is investigated using magic angle and polarization sensitive femtosecond transient absorption spectroscopy. The dissociation of I_2Br~- and V in acetonitrile are found to be very similar, except at the earliest times. A noticeable solvent dependence for the dissociation process is seen, e.g. in the degree of vibrational coherence and the rotational temperature of the I_2~- fragment and in the amount of recombination.