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On the importance of higher order anharmonic molecular couplings

机译:关于高阶非调和分子偶联的重要性

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The dynamics of molecular vibrational dephasing (IVR) are governed by the coupling structure of the vibrational Hamiltonian. We use a recently developed factorization model for normal coordinate potentials to compare the importance of direct high order couplings to both direct low order couplings and low-order coupling chains. The importance of high order couplings is characterized as a function of the vibrational energy and of molecular size. Particular attention is paid to phase cancellation effects in coupling chains, and to correlations between vibrational modes depending on their localization length. To account properly for IVR at high densities of states and long times, high order couplings must be taken into account. (C) 1998 American Institute of Physics. [References: 28]
机译:分子振动移相(IVR)的动力学受振动哈密顿量的耦合结构控制。我们将最近开发的因式分解模型用于法线坐标势,以比较直接高阶耦合对直接低阶耦合和低阶耦合链的重要性。高阶耦合的重要性被表征为振动能和分子大小的函数。特别要注意耦合链中的相位抵消效应,以及取决于振动模式定位长度的振动模式之间的相关性。为了在高密度和长时间状态下正确考虑IVR,必须考虑高阶耦合。 (C)1998美国物理研究所。 [参考:28]

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