Abstract
The assignability of spectra is based on the existence of regular patterns of energy levels. These patterns reflect an approximate factorization of the many-electron many-nucleus Hamiltonian into weakly interacting subsystems. It has been suggested that one of the quantum manifestations of classical chaos will be the intrinsic unassignability of fully resolved quantum spectra. On the other hand, de facto unassignability could result from either the superposition of too many patterns or the existence of classes of approximate quantum numbers and associated level patterns for which spectroscopic textbooks1 have left us unprepared. Examples of spectral complexity arising from both vibrational chaos and electronic simplicity are discussed.
© 1989 Optical Society of America
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