Single and multiple collision effects observed in the femtosecond spectroscopy of I-2 rare gas collision complexes: a statistical description

We use a simple statistical model to simulate recent femtosecond experiment s on the caging dynamics of I-2 in high pressure rare gas environments [Wan et al., J. Chem. Phys. 106, 4353 (1997)]. The collision-induced bound stat e motion in I-2 and its appearance in the pump/probe signal is perfectly re produced in our calculation. In the case where He is used as the I-2 collis ion partner we find multiple collisions to be important. The numerical resu lts can be explained analytically under simplified assumptions. (C) 1999 Am erican Institute of Physics. [S0021-9606(99)00307-4].