# STUDY OF THE $A\,^1\Sigma^+_u$ AND $b\,^3\Pi_{0u}$ STATES IN Cs$_2\,$: NEW DATA AND GLOBAL ANALYSIS

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/33261

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 Title: STUDY OF THE $A\,^1\Sigma^+_u$ AND $b\,^3\Pi_{0u}$ STATES IN Cs$_2\,$: NEW DATA AND GLOBAL ANALYSIS Creators: Salami, Houssam; Bergeman, Thomas; Dulieu, Olivier; Li, Dan; Xie, Feng; Li, Li Issue Date: 2008 Publisher: Ohio State University Abstract: The lowest excited states of alkali dimers are of particular interest in the creation of ultracold molecules and as pathways to higher states. Levels with mixed singlet-triplet character receive also considerable attention as window levels. The study of the $A\,^{1}\Sigma_u^{+}$ and $b\,^3\Pi_{0u^+}$ states in the heavier alkali molecules is relatively complicated due to the large spin-orbit interactions which mix the potentials of these two states. New, low-resolution data on the $b\,^3\Pi_{0u^\pm}$ states of Cs$_2$ have been obtained recently in Tsinghua University. These data characterize the bottom of the potential well of the $b$ state, provide vibrational assignment and determine the value of Te, and allow us to analyze and fit previously obtained data form Lab.$\,$Aime Cotton on mixed A/b states} 393 (1987), C. Amiot and O. Dulieu, J. Chem. Phys. \underline{117} 5155 (2002)}. The complete set of observations has been modeled using the discrete variable representation. Potential energy curves have been calculated relying on \emph{ab initio} potentials and Morse-type spin-orbit functions. Currently, the rms residual of our fit to the new data is 1.65 cm$^{-1}$ ($\sim$ the experimental uncertainty of the dispersed fluorescence recorded on a monochromator) and 0.14 cm$^{-1}$ to the older Fourier transform spectroscopy data which has experimental uncertainties of 0.003 cm$^{-1}$. Additional data would be very valuable, both in the regions where no levels have yet been observed and in those where few levels with dominant triplet character have been identified. \\ Work at Stony Brook was supported by NSF grant PHY 0652459. Description: J. Verges and C. Amiot, J. Mol. Spectrosc. 126 Author Institution: Department of Physics and Astronomy, SUNY; Stony Brook, NY 11794-3800; Laboratoire Aime Cotton, CNRS, Bat. 505, Campus d'Orsay, 91405 Orsay; France; Department of Physics, Tsinghua University, Beijing 100084, China URI: http://hdl.handle.net/1811/33261 Other Identifiers: 2008-WI-12