Probing Wave Packet Dynamics of I₂^- Anions with Pump--Probe Femtosecond Spectroscopy

The wave packet dynamics of I₂^- anions is studied by using the time-dependent wave packet method. Two conclusions can be drawn from the calculations. First, the period of the total photoelectron signal oscillating with the propagation of delay time is about 750fs. Second, the photoionization of I₂^- anions begin at the time 600fs, and the time needed for the population of the electronic state of I₂ neutral molecule to reach the maximum becomes shorter with the increasing delay time.