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arXiv 1908.03635physics.chem-ph
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用标准基组分析核激发和核电离的耦合团簇方法的性能

An analysis of the performance of coupled cluster methods for core excitations and core ionizations using standard basis sets

Johanna P. Carbone, Lan Cheng, Rolf H. Myhre, Devin Matthews, Henrik Koch, Sonia Coriani

摘要:

一个广泛的分析已经进行了性能的标准家庭的基组与层次的耦合集群方法CC 2,CCSD,CC 3和CCSDT在计算选定的氧,碳和氮的K-边(垂直)核心激发和电离能内的核心价分离计划中的分子水,氨,一氧化碳。完整的基组限制的激发能已估计通过不同的基组外推计划。标量相对论效应的重要性已经在无自旋精确双分量理论的单电子变体(SFX 2C-1 e)中得到了证实。

英文摘要:

An extensive analysis has been carried out of the performance of standard families of basis sets with the hierarchy of coupled cluster methods CC2, CCSD, CC3 and CCSDT in computing selected Oxygen, Carbon and Nitrogen K-edge (vertical) core excitation and ionization energies within a core-valence separated scheme in the molecules water, ammonia, and carbon monoxide. Complete basis set limits for the excitation energies have been estimated via different basis set extrapolation schemes. The importance of scalar relativistic effects has been established within the spin-free exact two-component theory in its one-electron variant (SFX2C-1e).

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