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Transfer of oscillator strength in regions of (avoided) crossings. The two-state approximation

✍ Scribed by Cleanthes A. Nicolaides; Donald R. Beck

Publisher: Elsevier Science
Year: 1978
Tongue: English
Weight: 342 KB
Volume: 53
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(78)80397-2

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✦ Synopsis

Parameterized hamikonians possess energy spectra which are functions of the parameters they contain. The energy levels of these spectra shift as the parameter varies. In regions of avoided crossings or crossings of energies corresponding to states of the same symmetry, the wavefunctions of *he (nearly) degenerate levels are assumed to be characterized primarily by the independent-particle model description of the two states involved. This two-state approsimation (TSA) is applied here to examine qualitatively the photoabsorption properties of systems which exhibit near degeneracies of excited states of the same symmetry.

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