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arXiv 1609.00644physics.chem-ph
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非绝热环- polymer分子动力学分析及其在电子振动光谱中的应用

An analysis of nonadiabatic ring-polymer molecular dynamics and its application to vibronic spectra

Jeremy O. Richardson, Philipp Meyer, Marc-Oliver Pleinert, Michael Thoss

摘要:

非绝热环聚合物分子动力学采用映射方法来描述环聚合物模型中的非绝热效应。在本文中,它是广义的,允许核和电子的自由度来描述不同数量的环聚合物珠。分析所得到的方法表明,随着电子映射变量的数量的增加,某些问题与该方法相关联,如非唯一的选择的映射哈密顿量和负人口导致倒置的势能面。循环变量上的显式积分减少了一般情况下初始分布的符号问题。一个新的应用程序的模拟振动光谱的描述和有前途的结果提出了一个模型系统。

英文摘要:

Nonadiabatic ring-polymer molecular dynamics employs the mapping approach to describe nonadiabatic effects within the ring-polymer ansatz. In this paper, it is generalized to allow for the nuclear and electronic degrees of freedom to be described by different numbers of ring-polymer beads. Analysis of the resulting method shows that as the number of electronic mapping variables increases, certain problems associated with the approach are removed, such as the non-unique choice of the mapping Hamiltonian and negative populations leading to inverted potential-energy surfaces. Explicit integration over cyclic variables reduces the sign problem for the initial distribution in the general case. A new application for the simulation of vibronic spectra is described and promising results are presented for a model system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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