A NONLINEAR HAMILTONIAN DESCRIBING THE ROVIBRATIONAL STATES OF DIATOMIC-MOLECULES

On the basis of the deformable body model and harmonic potential appro ximation a nonlinear quantum-mechanical Hamiltonian describing rovibra tional states of diatomic molecules has been derived. The obtained for mula is applied in evaluation of molecular constants and for predictio n of rovibrational and rotational spectra of the selected two-atomic s ystems giving quite satisfactory reproduction of the data values using only two molecular and one semiempirical parameters. This additional parameter is responsible for the change of curvature of internuclear p otential in the excited rotational states, and may be viewed as an ind icator of molecular susceptibility to rotation induced dissociation of a molecule.