title: Diffusion over an entropic barrier: non-Arrhenius behavior.
abstract: We have examined the temperature dependence of noise-induced escape rate of brownian particles between two distinct regions in a two-dimensional enclosure through a narrow bottleneck. Varying cross section of the confinement results in an effective entropic barrier in reduced dimension. The strong non-Arrhenius dependence of the escape rate is observed, which can be explained in terms of a crossover between entropy-dominated regime and energy-dominated regime in presence of an interplay of gravitational bias and thermal motion.
authors.affiliation: Department of Physical Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India.
authors.forename: Debasish
authors.initials: D
authors.lastname: Mondal
authors.forename: Deb Shankar
authors.initials: DS
authors.lastname: Ray
mesh_terms: D004058:Diffusion; D019277:Entropy; D008962:Models, Theoretical