Some symmetry aspects of the local‐mode description of vibrational structure

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Abstract
In the local‐mode description of vibrational structure, the nuclear coordinates—unlike the usual normal coordinates—do not reflect the molecular symmetry. Accordingly, the local‐mode product wave functions must be symmetry adapted. We discuss this simple procedure in light of its implications for the localization of vibrational energy and the dissociation limits of molecular excited states. These properties are in turn related to the separability of the total nuclear Hamiltonian and to the different ways in which the vibrational anharmonicity is “absorbed” by the local and normal coordinates.