Singlet–triplet separations of di-radicals treated by the DEA/DIP-EOM-CCSD methods

Singlet–triplet separations of di-radicals treated by the DEA/DIP-EOM-CCSD methods
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用 DEA/DIP-EOM-CCSD 方法处理双自由基的单线态-三线态分离

DOI:
10.1007/s00214-014-1514-5
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发表时间:
2014
影响因子:
1.7
通讯作者:
R. Bartlett
R. Bartlett
中科院分区:
化学4区
文献类型:
--
作者:
A. Perera;R. Molt;V. Lotrich;R. Bartlett

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双自由基亚甲基、三亚甲基甲烷、邻位、Meta位和对羟基苯甲酸酯以及环丁烷-1,2,3,4-四酮的单重态-三重态分裂已成为各种多参考(MR)耦合簇方法应用的测试系统。我们报告的结果接近双电离势(DIP)和双电子附着(DEA)运动方程耦合簇方法计算的基组限制。这些双自由基共享2孔2粒子MR问题的特性,并且通常用于评估MR方法的性能,但需要更仔细地研究它们自己作为基准。在这里,使用我们的CCSD(T)/6- 311 G(2d,2 p)优化的几何结构,我们报告DIP/DEACC结果和单参考(SR)CCSD,CCSD(T),KCCSD(T)和CCSDT结果进行比较。
The singlet–triplet splittings of the di-radicals methylene, trimethylene–methane, ortha-, meta- and parabenzynes, and cyclobutane-1,2,3,4-tetrone have become test systems for the applications of various multi-reference (MR) coupled-cluster methods. We report results close to the basis set limit computed with double ionization potential (DIP) and double electron attachment (DEA) equation-of-motion coupled-cluster methods. These diradicals share the characteristics of a 2-hole 2-particle MR problem and are commonly used to assess the performance of MR methods, and yet require more careful study unto themselves as benchmarks. Here, using our CCSD(T)/6- 311G(2d,2p) optimized geometries, we report DIP/DEACC results and single-reference (SR) CCSD, CCSD(T), KCCSD(T) and CCSDT results for comparison.
DOI: 10.1063/1.455184
发表时间: 1988-08-01
影响因子: 4.4
作者:
JENSEN, P;BUNKER, PR
通讯作者: BUNKER, PR