Abstract
Application of the deformable body model and the extended Dunham approach to determine the internal potentials for diatomic molecules is presented. The method is applied to rigid, semirigid, and van der Waals molecules in various representations of the Born-Oppenheimer potential expansions including the Dunham, Simons-Parr-Finlan, and Coolidge-James-Vernon functions. It is shown that the modified approach provides a reproduction of the rovibrational spectra to within the order of experimental errors, and produces potential parameters whose values smoothly change and significantly differ from those obtained in the standard scheme.
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