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Coupled perturbation theory within the antisymmetrized product of separated geminals ( APSG ) framework
Author(s) -
Dmitriev Yu.,
Peinel G.
Publication year - 1981
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560190507
Subject(s) - resolvent , perturbation theory (quantum mechanics) , perturbation (astronomy) , wave function , physics , chemistry , computational chemistry , quantum mechanics , mathematics , mathematical analysis
A coupled perturbation theory for the antisymmetrized product of separated geminals ( APSG ) approximation is derived. The variational principle for the APSG wave function in an external oscillating field is employed and a set of equations of the form analogous to the normal RPA is obtained. At this level the reduced resolvent in the form of a spectral expansion is written and it is used for the evaluation of the second‐order properties.