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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >A multireference coupled-cluster study of electronic excitations in furan and pyrrole
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A multireference coupled-cluster study of electronic excitations in furan and pyrrole

机译:呋喃和吡咯中电子激发的多参考耦合簇研究

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摘要

A multireference (MR), general-model-space (GMS), state-universal (SU), coupled-cluster (CC) method that considers singly (S) and doubly (D) excited cluster amplitudes relative to the reference configurations spanning the model space (GMS SU CCSD) is employed to investigate a number of low-lying excited states of two five-membered, six π -electron aromatic ring molecules, namely, furan and pyrrole. An extended basis set that includes diffuse functions and molecule-centered Rydberg functions is employed. Computed vertical excitation energies are compared with experimental values as well as with other theoretical results, namely, those obtained by the equation-of-motion (EOM) CCSD method or, equivalently, the symmetry adapted cluster configuration interaction (SAC-CI) method, by the MR CI method, by MR perturbation theory, and by other methods whenever available. For excited states dominated by single-excitations the GMS SU CCSD energies represent an improvement relative to the most closely related EOM CCSD results by about 0.1 eV.
机译:一种多参考(MR),通用模型空间(GMS),状态通用(SU),耦合集群(CC)方法,该方法相对于跨越该参考配置的参考配置分别考虑(S)和双(D)激发簇振幅模型空间(GMS SU CCSD)用于研究两个五元,六个π电子芳族环分子即呋喃和吡咯的许多低激发态。使用包括扩散函数和以分子为中心的里德伯格函数的扩展基础集。将计算出的垂直激励能量与实验值以及其他理论结果进行比较,这些结果是通过运动方程(EOM)CCSD方法或等效地通过对称适应的簇构型相互作用(SAC-CI)方法获得的,通过MR CI方法,通过MR扰动理论以及其他任何可用方法。对于单激发为主的激发态,相对于最密切相关的EOM CCSD结果,GMS SU CCSD能量代表了约0.1 eV的提高。

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