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Dynamical calculations are performed on an ab initio potential energy surface for KCN. Approximate variational solutions of the vibrational Eckart hamiltonian are presented for several states. Fundamental vibrations are found to lie at 302·7 cm-1 and 119·7 cm-1. An effective rotational hamiltonian is solved for several vibrational states allowing vibrational assignments to be made to the observed rotational spectrum.
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