Analytic description of highly excited vibrational-rotational states of diatomic molecules: II. Application to the hydrogen chloride molecule

Processing of the precise experimental data on transition frequencies and energy levels in the ground electronic state of the H{sup 35}Cl molecule was carried out on the basis of the asymptotically correct perturbation series analytically constructed to describe the discrete vibrational-rotational spectrum of a diatomic molecule. The perturbation series was shown to converge rapidly up to the dissociation energy E{sub D}, whereas the conventional Dunham series has a distinct limit of applicability equal to 0.39E{sub D}. 12 refs., 2 figs.