TRANSITION-STATE SPECTROSCOPY ON THE LI-HF SYSTEM

The transition state region of the Li-HF system is theoretically studi ed via infrared excitation of the ground state of the complex in the r eactant valley. The absorption spectrum shows intense peaks for which LiF is produced with high efficiency (approximate to 90%), while the r eaction has a very low cross section during the collision at the same energies. The reason is that the resonances reached through optical ex citation are in the vicinity of the transition state. (C) 1998 America n Institute of Physics. [S0021-9606(98)01432-9].