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arXiv 2009.09400physics.chem-ph
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振动组态相互作用非谐计算的振动分辨耦合团簇X射线吸收谱

Vibrationally Resolved Coupled Cluster X-Ray Absorption Spectra from Vibrational Configuration Interaction Anharmonic Calculations

Torsha Moitra, Diana Madsen, Ove Christiansen, Sonia Coriani

摘要:

用非简谐振动组态相互作用的Franck-Condon因子计算了一些小分子在K边的振动分辨近边X射线吸收谱。在CC 2、CCSD、CCSDR(3)和CC 3理论水平上获得了基态和核激发态的势能面,采用自适应密度指导方法(ADGA)方案选择进行能量计算的单点。我们首次尝试引入对模耦合项来描述多原子分子的势

英文摘要:

Vibrationally resolved near-edge x-ray absorption spectra at the K-edge for a number of small molecules have been computed from anharmonic vibrational configuration interaction calculations of the Franck-Condon factors. The potential energy surfaces for ground and core-excited states were obtained at the core-valence separated CC2, CCSD, CCSDR(3), and CC3 levels of theory, employing the Adaptive Density-Guided Approach (ADGA) scheme to select the single points at which to perform the energy calculations. We put forward an initial attempt to include pair-mode coupling terms to describe the potential of polyatomic molecules

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