期刊
PHYSICAL REVIEW E
卷 61, 期 3, 页码 3245-3248出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevE.61.3245
关键词
-
We consider the activated escape of chain molecule of N segments over a barrier, a generalization of the classic Kramers problem. Using the Rouse model, we show that the free energy of activation has a square root dependence on the temperature T, leading to a non-Arrhenius form for the rate. We further show that there is a special time dependent solution of the model, which corresponds to a kink in the chain, confined to the region of the barrier. The polymer goes from one side to the other by the motion of the kink in the reverse direction. If there is no free energy difference between the two sides of the barrier, then the kink moves by diffusion and the time of crossing t(cross)similar to N-2/T-3/2. If there is a free energy difference, then the kink moves with a nonzero velocity from the lower free energy side to the other, leading to t(cross)similar to N/root T.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据