Abstract
Parameterized hamiltonians 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 the (nearly) degenerate levels are assumed to be characterized primarily by the independent-particle model description of the two states involved. This two-state approximation (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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