The treatment of paper I of this series lsqb;J. Chem. Phys. 65, 2071 (1976)rsqb; is extended to totally symmetric modes. The effect of displacement of vibrational potentials and removal of parity as a conserved quantum number is illustrated through exact model calculations of energyhyphen;level diagrams and absorption spectra for the full range of coupling values compatible with the harmonic model chosen.
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