Preexponential factor of rate constant of low-temperature chemical reactions. Fluctuational width of tunneling channels and stability frequencesстатья
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Аннотация:The effect of transversal vibrations on the tunneling rate IS studied for the two-dimensional potential in terms of the instanton technique, which allows to obtain the Gutzwiller-Miller formula expressing the tunneling probabilty via the stability parameters as well as the analogue of the fluctuational-dissipative theorem for the rms transversal vibration coordinate. The vibrational-adiabatic approximation corresponds to a slow variation of the transversal vibration frequency w along the tunneling path. The opposite case of a step-like variation of o is also examined. In general, the transition probability is the product of the tunneling rate in the vibrational-adiabatic potential and the geometric transmission factor which is less than unity owing to reflection. The role of dissipation in the two-dimensional model is also discussed.