Abstract
The singlet–triplet splittings of the di-radicals methylene, trimethylene–methane, ortha-, meta- and para-benzynes, 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 di-radicals 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/DEA-CC results and single-reference (SR) CCSD, CCSD(T), ΛCCSD(T) and CCSDT results for comparison.
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Acknowledgments
This work was supported by the United States Army Research Office, under Grant No. 54344CH. We are pleased to contribute this paper to this Special Issue in honor of Isaiah Shavitt, who one of us (RJB) had the pleasure of knowing and collaborating with from 1976. Shavitt was a gentleman and a scholar. Our book on Many-Body Methods in Chemistry and Physics: MBPT and Coupled-Cluster Theory, was realized though Shi Shavitt’s attention to detail, clarity and persistence. “To the greater craftsman.”
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Dedicated to the memory of Professor Isaiah Shavitt and published as part of the special collection of articles celebrating his many contributions.
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Perera, A., Molt, R.W., Lotrich, V.F. et al. Singlet–triplet separations of di-radicals treated by the DEA/DIP-EOM-CCSD methods. Theor Chem Acc 133, 1514 (2014). https://doi.org/10.1007/s00214-014-1514-5
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DOI: https://doi.org/10.1007/s00214-014-1514-5