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arXiv 1507.05959physics.chem-phcond-mat.otherquant-ph
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原子和双原子系统中的非绝热效应有多大?

How Large are Nonadiabatic Effects in Atomic and Diatomic Systems?

Yubo Yang, Ilkka Kylanpaa, Norm Tubman, Jaron Krogel, Sharon Hammes-Schiffer, David Ceperley

摘要:

随着近年来对非绝热系统进行高精度模拟的发展,人们有可能确定在零点能之外有多少能量归因于核量子效应。本文在不采用玻恩-奥本海默近似的情况下,计算了原子和分子系统的非相对论基态能量。为此,我们利用固定节点扩散蒙特卡罗方法,其中节点取决于电子和离子的位置。我们报告的基态能量为所有系统的研究,电离能的第一行原子和原子化能的第一行的电子。我们发现,在我们结果的准确性范围内,原子的电离能几乎与博恩-奥本海默近似无关。原子化能的分子系统,然而,显示小的影响,电子和核之间的非绝热耦合。

英文摘要:

With recent developments in simulating nonadiabatic systems to high accuracy, it has become possible to determine how much energy is attributed to nuclear quantum effects beyond zero-point energy. In this work we calculate the non-relativistic ground-state energies of atomic and molecular systems without the Born-Oppenheimer approximation. For this purpose we utilize the fixed-node diffusion Monte Carlo method, in which the nodes depend on both the electronic and ionic positions. We report ground-state energies for all systems studied, ionization energies for the first-row atoms and atomization energies for the first-row hydrides. We find the ionization energies of the atoms to be nearly independent of the Born-Oppenheimer approximation, within the accuracy of our results. The atomization energies of molecular systems, however, show small effects of the nonadiabatic coupling between electrons and nuclei.

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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