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arXiv 1409.3671physics.chem-ph
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三维过渡金属原子非相对论基态能量的精确计算

Accurate nonrelativistic ground-state energies of 3d transition metal atoms

A. Scemama, T. Applencourt, E. Giner, M. Caffarel

摘要:

本文用固定结点扩散蒙特卡罗(FN-DMC)方法计算了过渡金属原子3d系列的非相对论基态能量。选定的多行列式展开与CIPSI方法(配置相互作用,使用微扰选择迭代),包括最突出的决定因素的完整CI扩展被用作试验波函数。使用一个最大的几万个决定因素,总DMC能量的固定节点的错误被发现大大减少了一些原子与Hartree-Fock节点。本文给出的FN-DMC/(CIPSI节点)基态能量是迄今为止报道的最精确的值。由于FN-DMC总能量的变分性质,结果还提供了全电子相关能绝对值$|E_c|$的下界。

英文摘要:

We present accurate nonrelativistic ground-state energies of the transition metal atoms of the 3d series calculated with Fixed-Node Diffusion Monte Carlo (FN-DMC). Selected multi-determinantal expansions obtained with the CIPSI method (Configuration Interaction using a Perturbative Selection made Iteratively) and including the most prominent determinants of the full CI expansion are used as trial wavefunctions. Using a maximum of a few tens of thousands determinants, fixed-node errors on total DMC energies are found to be greatly reduced for some atoms with respect to those obtained with Hartree-Fock nodes. The FN-DMC/(CIPSI nodes) ground-state energies presented here are, to the best of our knowledge, the most accurate values reported so far. Thanks to the variational property of FN-DMC total energies, the results also provide lower bounds for the absolute value of all-electron correlation energies, $|E_c|$.

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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