Degenerate perturbation theory

作者：Daniel Klein · 发表于：The Journal of Chemical Physics · 年份：1974 · DOI：10.1063/1.1682018 · 被引用次数：211 · 研究领域：Advanced Chemical Physics Studies、Mathematical functions and polynomials、Theoretical and Computational Physics

A number of different perturbation formulations found in the literature are discussed. Although these formulations are derived in quite different ways, simple relations among these derivations are described and, in fact, some are shown to yield identical results. One of these degenerate perturbation theories resulting from different formulations due to Van Vleck, Kemble, and Primas, to des Cloizeaux, and to Buleavski is considered in greater detail. Its linked and cluster expansion properties and some other resummation techniques are briefly discussed.