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The treatment of paper I of this series [J. Chem. Phys. 65, 2071 (1976)] 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 energy-level diagrams and absorption spectra for the full range of coupling values compatible with the harmonic model chosen.
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Gregory et al. (1977) studied this question.
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