Tunneling transition probability for a particle interacting with an anharmonic bath is found in a time-dependent Hartree approximation. The general expression is presented in terms of medium Keldysh functions that are assumed to be known. Furthermore, the transition probability is calculated in the noninteracting-blip approximation where the rate constant does not exhibit an activation dependence at high temperatures. The reorganization energy E-r and the renormalized reaction heat (epsilon) over tilde are experessed in terms of the correlation matrix for a solvent and internal modes in both quantum and classical regimes. It is shown that E-r and (epsilon) over tilde are temperature dependent. (C) 2005 American Institute of Physics.
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