In this paper, we present a general method to constrain the classical energy of a vibrational mode to be greater than a specifled amount. In particular, zerohyphen;point energy constraints can be applied with this method to (zerohyphen;order) vibrational modes of a polyatomic system or complex. A demonstration of the method is made for a model twohyphen;mode Henonndash;Heiles Hamiltonian.
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