Dalgarno-Lewis Method Revisited

Details Dalgarno-Lewis Method Revisited Dalgarno-Lewis Method Revisited

2010-12-21

arxiv.org/abs/1012.4783v1

Physics

Mathematical Physics

6 pages of LATEX

Scientific paper

Proving the existence of an operator that connects non-perturbed states to
perturbed states, an alternative derivation of the Dalgarno-Lewis method is
given. To illustrate that the Dalgarno-Lewis method is an apt tool for
algebraic Hamiltonians, the method is applied to one class of such systems,
namely deep three-dimensional potentials with positive parity.

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