Abstract
A general expression for the rovib kinetic energy operator in a system of orthogonal internal coordinates is derived for arbitrary amplitudes of motion. Plots of the molecular potential in such coordinates serve to determine coordinate subsets in which the potential approaches separability. A revision of previous theory for the three-body problem is presented. A rovib hamiltonian for non-branched four-atom molecules (such as C 2H 2) is derived. Certain features of application to polyatomic (five-atom) molecules are considered.
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