Improved LeRoy-Bernstein near-dissociation expansion formula, and prospect for photoassociation spectroscopy.
NDE (Near-dissociation expansion) including LeRoy-Bernstein formulas are improved by taking into account the multipole expansion coefficients and the nonasymptotic part of the potential curve. The theory is tested with the Rydberg-Klein-Rees (RKR) potential curve of the Cs(2)(0(g) (-)6s+6p(3/2)) state. Results indicate that the formula could be used to improve the determination of the asymptotic coefficient (within a 1% accuracy) and to extract relativistic correction from photoassociation spectra of long-range potential curve of diatomic molecules.
Laboratoire Aime Cotton, CNRS II, Bat. 505, Campus d'Orsay, 91405 Orsay cedex, France. daniel.comparat@lac.u-psud.fr
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Comparat