# PREDICTIONS OF THE HYPERFINE STRUCTURE OF THE $Cs_{2} 0^{-}_{g}$ LONG-RANGE MOLECULAR STATE DISSOCIATING INTO $Cs(6s^{2}S_{1/2})+Cs(6p^{2}P_{3/2})$

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 Title: PREDICTIONS OF THE HYPERFINE STRUCTURE OF THE $Cs_{2} 0^{-}_{g}$ LONG-RANGE MOLECULAR STATE DISSOCIATING INTO $Cs(6s^{2}S_{1/2})+Cs(6p^{2}P_{3/2})$ Creators: Rousseau, S.; Magnier, S.; Hadinger, G.; Aubert-Frécon, M. Issue Date: 1998 Publisher: Ohio State University Abstract: The bound long-range $Cs_{2} 0^{-}_{g}$ state dissociating into $Cs(6s^{2}S_{1/2})+Cs(6p^{2}P_{3/2})$ and correlated at smaller distances to the slightly bound (1)$^{3}\Pi_{g}$ state was predicted in 1985 [1] to have a well depth of $\sim 76 cm^{-1}$ at an equilibrium internuclear separation of $\sim 26a_{0}$. In this previous work, we approximated the interaction energy via the usual multipolar expansion up to $R^{-8}$ and we neglected both exchange and overlap effects. Considering the LeRoy [2] or modified LeRoy criteria [3], it appears that such approximations can be considered as valid for $R_{L}>26a_{0}$ or $R_{ML}>23a_{0}$. Then inner turning points of the potential are at internuclear separations for which exchange and overlap effects have to be considered. Here we have improved our description of the potential including these two contributions and using more accurate values for the expansion coefficients $C_{n}$. We have also extended our work to the predictions of the hyperfine structure of the $Cs_{2} 0^{-}_{g}$ state by considering basis functions describing atomic hyperfine structure. Description: Reference [1] B. Bussery and M. Aubert-Fr\'{e}con J. Mol. Spect 113 21 (185) [2] R.J. LeRoy Can. J. Phys. 52 246 (1974) [3] B. Ji, C.C. Tsai and W.C. Stwalley Chem. Phys. Lett. 236 242 (1995) Author Institution: Laboratoire de Spectrom\'{e}trie Ionique et Mol\'{e}culaire UMR 5579, B\^{a}t. 205, 43 Bd du 11 Novembre 1918; Laboratoire de Physique Mol\'{e}culaire et des Collisions, B\^{a}t. 205, 43 Bd du 11 Novembre 1918; Laboratoire de Spectrom\'{e}trie lonique et Mol\'{e}culaire UMR 5579, B\^{a}t. 205, 43 Bd du 11 Novembre 1918 URI: http://hdl.handle.net/1811/18878 Other Identifiers: 1998-RC-02