The problem of the computation of the Centrifugal Distortion Constants (CDC) related to a diatomic potential is considered. The analytical expressions obtained from a reformulation of the Rayleigh-Schrodinger perturbation theory are used [Kobeissi et al., J. Mol. Spectrosc., 138, 1 (1989)l; these are -C t = l em(@o@n-m) where R = lh2, @o = $, is the vibrational wave function (corresponding to the given energy E, = eo) and @z, . . . , are the "rotational corrections" to a0, solutions of the rotational (nonhomogeneous) Schrodinger equations. These equations are integrated by using a recent integrator using a powerful local control allowing (for @, J a high accuracy.
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