Calculation of single-beam two-photon absorption rate of lanthanides: effective operator method and perturbative expansion

Details Calculation of single-beam two-photon absorption rate of lanthanides: effective operator method and perturbative expansion Calculation of single-beam two-photon absorption rate of lanthanides: effective operator method and perturbative expansion

2005-05-24

arxiv.org/abs/physics/0505161v1

THE JOURNAL OF CHEMICAL PHYSICS 121, 8183-6 (2004)

Physics

Chemical Physics

11 preprint pages

Scientific paper

10.1063/1.1802791

Perturbative contributions to single-beam two-photon transition rates may be divided into two types. The first, involving low-energy intermediate states, require a high-order perturbation treatment, or an exact diagonalization. The other, involving high energy intermediate states, only require a low-order perturbation treatment. We show how to partition the effective transition operator into two terms, corresponding to these two types, in such a way that a many-body perturbation expansion may be generated that obeys the linked cluster theorem and has a simple diagrammatic representation.

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