A projector formulation for the Van Vleck transformation
- 1 April 1974
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 27 (4), 959-968
- https://doi.org/10.1080/00268977400100881
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.Keywords
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- An approximate block diagonalization for hermitian matrices as an improvement on successive Van Vleck transformationsMolecular Physics, 1973
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