DETERMINATION OF THE $0^{-}_{g}$ PURE LONG RANGE POTENTIAL CURVE OF $Rb_{2}$ AND $Cs_{2}$; APPLICATION TO ULTRACOLD MOLECULES FORMATION

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2001

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Ohio State University

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This work presents an accurate study of the $0^{-}_{g} (P_{3/2})$ pure long range electronic state of the $^{87}Rb(5S)-^{87}Rb(5P_{3/2})$ and $^{133}Cs(6S)-^{133}Cs(6P_{3/2})$ molecular systems. Generalized simulated annealing method was used in order to reduce the high resolution spectral data provided by photoassociative spectroscopy of ultra cold $^{87}Rb$ and $^{133}Cs$ atoms. The analysis has allowed the determination of the effective dispersion parameters, the chemical exchange energy contribution as well as the dissociation energy concerning the analytical potential representation of the $0^{-}_{g} (P_{3/2})$ state for both, $Rb_{2}$ and $Cs_{2}$, molecules. A detailed comparison with the potential curves obtained through RKR procedure is performed, and the consequences for ultracold molecules formation rates are discussed.

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Author Institution: Laboratoire Aim\'e Cotton, B\^at 505

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