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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Optimizing the performance of the multiconfiguration molecular mechanics method
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Optimizing the performance of the multiconfiguration molecular mechanics method

机译:优化多构型分子力学方法的性能

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Multiconfiguration molecular mechanics ( MCMM) is a general algorithm for constructing potential energy surfaces for reactive systems (Kim, Y.; Corchado, J. C.; Villa, J.; Xing, J.; Truhlar, D. G. J. Chem. Phys. 2000, 112, 2718). This paper illustrates how the performance of the MCMM method can be improved by adopting improved molecular mechanics parameters. We carry out calculations of reaction rate constants using variational transition state theory with optimized multidimensional tunneling on the MCMM PESs for three hydrogen transfer reactions, and we compare the results to direct dynamics. We find that the MCMM method with as little as one electronic structure Hessian can describe the dynamically important regions of the ground-electronic state PES, including the corner-cutting-tunneling region of the reaction swath, with practical accuracy.
机译:多配置分子力学(MCMM)是一种用于构造反应系统势能面的通用算法(Kim,Y .; Corchado,JC; Villa,J .; Xing,J .; Truhlar,DGJ Chem.Phys.2000,112,2718 )。本文说明了如何通过采用改进的分子力学参数来改善MCMM方法的性能。我们在MCMM PES上使用变迁过渡态理论和优化的多维隧穿,对三个氢转移反应进行了反应速率常数的计算,并将结果与​​直接动力学进行了比较。我们发现,仅用一个电子结构Hessian的MCMM方法就可以准确地描述基电子态PES的动态重要区域,包括反应带的切角隧道区域。

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