Activated rate processes in many dimensions: energy diffusion with slow adjustment of a nonreactive mode
Activated rate processes in many dimensions: energy diffusion with slow adjustment of a nonreactive mode
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多个维度的激活速率过程：缓慢调整非反应模式的能量扩散
DOI：
10.1016/s0378-4371(97)00565-7
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发表时间：
1998
影响因子：
3.3
通讯作者：
S. Lin
中科院分区：
文献类型：
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作者：
A. Berezhkovskii;V. Zitserman;Dah;J. Kuo;S. Lin
在反应模式（能量扩散）上的弱摩擦和非反应坐标上的高摩擦条件下，解析地研究了二维活化速率过程。结果发现，该过程的情况下，作为一个结果，逃逸动力学至关重要地依赖于模式耦合的强度。当耦合很强时，能量扩散不会表现出来。动力学是单指数的速率常数独立的反应模式上的摩擦。对于中等模式耦合，能量扩散起着重要作用。不同的工艺方案，因此，动力学可以实现取决于两种模式上的摩擦强度。多指数衰减和单指数动力学都是可能的。后者可能发生在粒子通过势面上的鞍点逃逸（传统的逃逸场景）或粒子在避开鞍点的路径上逃逸时。
Activated rate processes in two dimensions are studied analytically under the condition of weak friction on the reactive mode (energy diffusion) and high friction on the nonreactive coordinate. It is found that the process scenario and, as a consequence, the escape kinetics crucially depend on the strength of the mode coupling. When the coupling is strong the energy diffusion does not manifest itself. The kinetics is single-exponential with a rate constant independent of the friction on the reactive mode. For moderate mode coupling the energy diffusion plays an important role. Different process scenarios and, hence, the kinetics can be realized depending on the strength of friction on the both modes. Both multiexponential decay and single-exponential kinetics are possible. The latter may take place either when particles escape via the saddle on the potential surface (the traditional escape scenario) or when particles escape on a path that avoids the saddle point.
R. 冈崎：J. Am。
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