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. 2021 Mar 12;8(2):024101. doi: 10.1063/4.0000070

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© 2021 Author(s).

2329-7778/2021/8(2)/024101/15

All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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FIG. 2. — Schematics of the standard CVS-EOM-CCSD, LSOR-CCSD, and HSOR-CCSD protocols. The crossed configurations are formally doubly excited with respect to the ground-state reference.