Ray Somrita, Mondal Debasish, Bag Bidhan Chandra
Department of Chemistry, Visva-Bharati, Santiniketan 731 235, India.
Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700 032, India.
J Chem Phys. 2014 May 28;140(20):204105. doi: 10.1063/1.4878235.
In this paper, we have demonstrated that resonant activation (RA) is possible even in a thermodynamically closed system where the particle experiences a random force and a spatio-temporal frictional coefficient from the thermal bath. For this stochastic process, we have observed a hallmark of RA phenomena in terms of a turnover behavior of the barrier-crossing rate as a function of noise correlation time at a fixed noise variance. Variance can be fixed either by changing temperature or damping strength as a function of noise correlation time. Our another observation is that the barrier crossing rate passes through a maximum with increase in coupling strength of the multiplicative noise. If the damping strength is appreciably large, then the maximum may disappear. Finally, we compare simulation results with the analytical calculation. It shows that there is a good agreement between analytical and numerical results.
