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A diagrammatic interpretation of formal Rayleigh—Schrödinger perturbation theory

✍ Scribed by Valdimír Kvasnička

Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
751 KB
Volume
32
Category
Article
ISSN
0009-2614

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✦ Synopsis

A diagammatic,interprct~tion of the formal (i.e.; without second quantization ~ormalismj quasi-degenerate Rayleigh-Sciuiidinger perturbation theory with non-hem+ian model hamiltonian is suggested. fn this appro&.

:

the diagrammatic expressions for the Bloch wave operator U as well as for the model interaction operator GRS are obtained. in the framework of the suggested grapholofy it is pdssib!e to perform a detailed study of the aI.gebraic

.'

structure of individual perturbation contributions. The present diagram'matic approach has some general features of Brandow's folded-diagram method initially introduced in order to construct the many-body degenerate Rayleigh-' SchrGdinger pe~urbation theory.

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