Journal
CHEMICAL PHYSICS LETTERS
Volume 447, Issue 1-3, Pages 175-179Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2007.09.006
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We propose a simple F12 geminal correction in multi-reference perturbation theory. An explicitly correlated term is introduced in the external excitations of the first order wave function in an internally contracted manner. By the use of the s- and p-wave cusp conditions, the F12 correction is expressed as the expectation value of a two-body effective operator, which reduces to the MP2-F12/A*(SP) energy in the single reference limit. The performance of the F12 multi-reference perturbation method is demonstrated for C, CH2, O-2, and SiC3. (C) 2007 Elsevier B.V. All rights reserved.
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