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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 27, 1974 - Issue 4
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Original Articles

A projector formulation for the Van Vleck transformation

II. Near-degenerate case

&
Pages 959-968 | Received 16 Aug 1973, Published online: 22 Aug 2006
 

Abstract

The formulation of part I is extended to cover also the case where the zeroth-order hamiltonian has near-degenerate eigenvalues in the subspace to be isolated by the transformation. Three different approaches are used, and a comparison is made between the degenerate approach and the method of denominator corrections.

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