On the role of coupled-clusters' full triple and perturbative quadruple excitations on rovibrational spectra of van der Waals complexes

On the role of coupled-clusters' full triple and perturbative quadruple excitations on rovibrational spectra of van der Waals complexes
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耦合团簇全三重和微扰四重激发对范德华配合物振动光谱的作用

DOI:
10.1080/00268976.2021.1955989
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发表时间:
2021
期刊:
影响因子:
1.7
通讯作者:
Szalewicz, Krzysztof
Szalewicz, Krzysztof
中科院分区:
化学4区
文献类型:
--
作者:
Jankowski, Piotr;Grabowska, Ewelina;Szalewicz, Krzysztof

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研究了H-CO在范德华分子势能面(PESs)上耦合团簇迭代三次和非迭代四次电子激发的重要性。通过理论光谱与实验光谱的比较,对这一重要性进行了评价。有些令人惊讶的是,虽然它们对相互作用能的贡献低于3%,但它们的加入使理论相对于实验的误差减少了一个数量级,并且只有当它们被包括在某些区域时,光谱的定性一致才得以实现。这些观察结果的主要原因是这些效应显著地改变了PES的各向异性。
The importance of coupled clusters iterative triple and noniterative quadruple,, electron excitations on the potential energy surfaces (PESs) of van der Waals molecules is examined for H–CO. The evaluation of this importance is performed by comparing theoretical spectra with experiment. Somewhat surprisingly, although thecontributions to interaction energies are below 3%, the inclusion of them reduces the error of theory with respect to experiment by an order of magnitude and qualitative agreement of the spectra in some regions is achieved only when they are included. The main reason for these observations is that theeffects significantly change the anisotropy of the PES.
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