Abstract
Effective operators needed in single-beam two-photon transition calculations have been represented with modified Goldstone diagrams similar to the type suggested by Duan et al. [C.-K. Duan, G. Ruan, M.F. Reid, J. Chem. Phys. 121 (2004) 5071]. The rules to evaluate these diagrams are different from those for effective Hamiltonian and one-photon transition operators. It is verified that the perturbation terms considered contain only connected diagrams and the evaluation rules are simplified and given explicitly.
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