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
复制标题
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
复制
发表时间:
2014
影响因子:
1.7
通讯作者:
R. Bartlett
中科院分区:
文献类型:
--
作者:
A. Perera;R. Molt;V. Lotrich;R. Bartlett
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.
影响因子:
4.4
作者:
JENSEN, P;BUNKER, PR
通讯作者:
BUNKER, PR