Transition-potential coupled cluster II: optimisation of the core orbital occupation number
Transition-potential coupled cluster II: optimisation of the core orbital occupation number
复制标题
跃迁势耦合团簇II:核心轨道占据数的优化
DOI:
10.1080/00268976.2022.2088421
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发表时间:
2022
影响因子:
1.7
通讯作者:
Matthews, Devin A.
中科院分区:
文献类型:
--
作者:
Simons, Megan;Matthews, Devin A.
The issue of orbital relaxation in computational core-hole spectroscopy, specifically x-ray absorption, has been a major problem for methods such as equation-of-motion coupled cluster with singles and doubles (EOM-CCSD). The transition-potential coupled cluster (TP-CC) method is utilised to address this problem by including an explicit treatment of orbital relaxation via the use of reference orbitals with a fractional core occupation number. The value of the fractional occupation parameterλwas optimised for both TP-CCSD and XTP-CCSD methods in an element-specific manner due to the differences in atomic charge and energy scale. Additionally, TP-CCSD calculations using the optimised parameters were performed for the K-edge absorption spectra of gas-phase adenine and thymine. TP-CCSD reproduces the valence region well and requires smaller overall energy shifts in comparison to EOM-CCSD, while also improving on the relative position and intensities of several absorption peaks.
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影响因子:
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DOI:
--
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期刊:
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