ISOSTATIONARY FUNCTIONS FOR MULTIMODE AND MULTILEVEL JAHN-TELLER SYSTEMS

The method of isostationary functions, first introduced for linear Jah n-Teller problems within a single electronic term, is generalized to m ultimode and multilevel problems. Analytic expressions are obtained fo r the case of linear vibronic coupling of a general form, including bo th simply and non-simply reducible groups. It is shown that the static multimode Jahn-Teller problem for non-simply reducible groups can alw ays be reduced to an ideal single-mode problem.