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面向化学反应计算的相对论方法X2C
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摘要
多态反应(包括自旋禁阻反应和自旋加速反应)一直是理论化学计算中的难点[1],主要问题在于常用的相对论量子化学模型在计算解析导数时存在种种问题。精确二分量(X2C)是近几年发展起来的一种新型相对论量子化学方法,具有简单,准确,高效的特点[2]。目前X2C已经实现了解析的一阶和二阶导数[3],从而为研究相对论效应影响下的化学反应机理(包括多态反应以及重元素参与的反应)提供了可能。然而X2C仍存在不足:对于周期体系会得到发散解;解析Hessian需要求解很多相对论一阶导数矩阵的耦合项,对于中等以上的体系极其耗时。为解决上述问题,需要基于"用原子合成分子"的思想[4],开发下一代X2C及其解析导数的程序。
For multi-state reactions(including spin-forbidden and spin-acceleration reactions) [1], there have been no effective methods and programs to elucidate their mechanisms because of some difficulties in the analytic derivative calculations of relativistic methods.The recently developed exact two-component(X2C) relativistic method is simple, accurate, and fast [2], and its analytic derivatives [3] make it possible to calculate relativistic chemical reactions(including multi-state reactions and heavy atom containing reactions).However, X2C still has some disadvantages: 1) it becomes divergent in the case of periodic boundary conditions; and 2) a lot of coupling terms of the relativistic first-order derivative matrices make the calculation of Hessian very expensive.To solve the problems, the next version of X2C and its analytic derivatives should be developed and programmed based on the idea of "from atoms to molecule" [4].
引文
[1]Harvey,J.N.WIREs Comput.Mol.Sci.2014,4,1.
    [2]Liu W.;Peng,D.J.Chem.Phys.2006,125,044102.
    [3]Cremer,D.;Zou,W.;Filatov,M.WIREs Comput.Mol.Sci.2014,4,436.
    [4]Peng,D.;Liu,W.;Xiao,Y.;Cheng,L.J.Chem.Phys.2007,127,104106.

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