ACTIVATED CHEMISTRY IN THE PRESENCE OF A STRONGLY SYMMETRICALLY COUPLED VIBRATION

In the gas phase, tunneling reaction rates can be significantly enhanc ed if the reaction coordinate is symmetrically coupled to a harmonic o scillation, as has been emphasized by Benderskii and co-workers [Adv. Chem. Phys. 88, 1 (1994)]. This is due to the fact that the symmetric coupling leads to modulation of the barrier height. Similar effects ha ve been observed in reactions in model condensed phase studies, as in the Hamiltonians that have been studied by Borgis and Hynes [J. Chem. Phys. 94, 3619 (1991)] and Suarez and Silbey [J. Chem. Phys. 94, 4809 (1991)]. All of these works assume that tunneling proceeds from the gr ound state. In this paper, we use the exponential resummation techniqu e that we used in our recent work on the quantum Kramers problem, to s tudy the case when there can be excitations to higher states and activ ated transmission over a barrier. We present a general methodology to exactly include direct coupling between the reaction coordinate and th e symmetrically coupled promoting vibration and find that the rate of reactions in condensed phases is enhanced as in the case of tunneling from the ground state. This effect, however, is strongly modulated by loss of coherence induced by the condensed phase environment. (C) 1998 American Institute of Physics.