Transition-potential coupled cluster II: optimisation of the core orbital occupation number

Transition-potential coupled cluster II: optimisation of the core orbital occupation number
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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
期刊:
影响因子:
1.7
通讯作者:
Matthews, Devin A.
Matthews, Devin A.
中科院分区:
化学4区
文献类型:
--
作者:
Simons, Megan;Matthews, Devin A.

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计算核-孔光谱中的轨道弛豫问题,特别是X射线吸收,一直是诸如具有单和双的运动方程耦合簇(EOM-CCSD)的方法的主要问题。过渡势耦合簇(TP-CC)方法是用来解决这个问题,包括明确的治疗轨道松弛通过使用参考轨道与分数核心占用数。由于原子电荷和能量标度的差异,TP-CCSD和XTP-CCSD方法的分数占据参数λ的值以元素特异性方式进行了优化。此外,TP-CCSD计算使用优化的参数进行气相腺嘌呤和胸腺嘧啶的K边吸收光谱。TP-CCSD很好地再现了价区,并且与EOM-CCSD相比需要更小的总体能量偏移,同时还改善了几个吸收峰的相对位置和强度。
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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