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Chinese Physics B

Reanalysis of the photoassociation spectrum of133Cs2(6P3/2) 1gstate

Jie Ma, Yuqing Li, Jizhou Wu, Qun-Chao Fan, Hao Feng, Weiguo Sun, Liantuan Xiao, Suotang Jia

Published Aug 1, 2013• 0 citations
Publisher

Abstract

Reanalysis of the photoassociation spectrum of the weakly binding (6S1/2 + 6P3/2) 1g133Cs2 levels, reported in the previous study [J. Mol. Spectro. 255 (2009) 106], is performed by using a Lu—Fano graph coupled to the improved LeRoy—Bernstein formula including two additional modified terms. A more accurate coefficient (c3) is obtained for the leading long-range potential (−c3/R3) of a diatomic molecule.

DOI
10.1088/1674-1056/22/8/083302

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Reanalysis of the photoassociation spectrum of the weakly binding (6S1/2 + 6P3/2) 1g133Cs2 levels, reported in the previous study [J. Mol. Spectro. 255 (2009) 106], is performed by using a Lu—Fano graph coupled to the improved LeRoy—Bernstein formula including two additional modified terms. A more accurate coefficient (c3) is obtained for the leading long-range potential (−c3/R3) of a diatomic molecule.
We present an analysis of spectroscopic data concerning the long-range molecular state (6s1∕2+6p1∕2)0u+(6{s}_{1∕2}+6{p}_{1∕2}){0}_{u}^{+}(6s1∕2​+6p1∕2​)0u+​ of 133Cs2^{133}\mathrm{Cs}_{2}133Cs2​ [M. Pichler, H. Chen, and W. C. Stwalley, J. Chem. Phys. 121, 1796 (2004)] by using the Lu-Fano method coupled to the improved LeRoy-Bernstein formula. The obtained Lu-Fano graph exhibits the coupling of molecular series to the (6s1∕2+6p3∕2)0u+(6{s}_{1∕2}+6{p}_{3∕2}){0}_{u}^{+}(6s1∕2​+6p3∕2​)0u+​ state. The coupling is due to the spin effects in the molecule. A two-channel model involving the improved LeRoy-Bernstein formula allows us to characterize the molecular series, to localize the perturbing levels, to evaluate the coupling in the vicinity of each perturbing level (five observed for Cs) in a two-level approach and in a more accurate multilevel description. Furthermore, we predict the energy and the width of the first predissociated level.
The photoassociation spectroscopic data of the long-range molecular 1g state of Cs 2 in the asymptotic range red detuned [-5.02, -2.45 cm -1 ] to the (6S 1/2 +6P 3/2 ) dissociation limit detected using photon counting technique are presented and 18 new high-lying vibrational energy levels are obtained. Fitting experimental data to the improved LeRoy–Bernstein (LRB) formula, we have obtained the long-range molecular coefficient c 3 with a high precision and also demonstrated the necessity of the improved LRB formula for more precise c 3 coefficient by analyzing the residual from fitting procedure.
1 Weakly bound (6s 1/2 +6p 1/2)0 g - Cs 2 levels analysed using the vibrational quantum defect. Detection of two deeply bound (6s 1/2 +6p 3/2)0 g - levels. Abstract. We report on the analysis of the (6s 1/2 +6p 1/2)0 g - weakly-bound levels of Cs 2 detected by photoassociation spectroscopy. We compare three methods of analysis: the use of the LeRoy-Bernstein formula, the use of the improved LeRoy-Bernstein formula and the use of the vibrational quantum defect. We show that the vibrational quantum defect method is more sensitive than the other methods and allows us to detect two deeplybound levels of the (6s 1/2 +6p 3/2)0 g - potential, which are not detected by the others methods. The binding energies of the levels are found to be 565.49 cm -1 and 591.43 cm-1 below the (6s 1/2 +6p 3/2) dissociation limit.
Photoassociation spectroscopy with high resolution for 0u+(6P3/2) long-range state of ultracold cesium molecules has been measured experimentally using the modulated trap loss fluorescence spectroscopy technology. The spectral range has been extended over 60 cm-1 below the 6S1/2 + 6P3/2 dissociation limit as compared with other groups. twenty-five new observations of the Cs2 0u+ in long-range state are reported. The vibrational binding energies of these states are analyzed by using the LeRoy-Bernstein formula. The long-range parameter C3 in molecular 0u+(6P3/2) state is derived for 16.1030.010, and the corresponding molecular potential curve is depicted.
We report on the study of the (ns1/2+np1/2)0g−Rb2 and Cs2 weakly‐bound‐level photoassociative spectroscopy in a magneto‐optical trap. For the analysis, a Lu‐Fano graph is plotted for each set of data. We show that an improved LeRoy‐Bernstein formula must to be used. The data is then analysed by a classical procedure using the improved LeRoy‐Bernstein formula. The (ns1/2+np1/2)0g−Rb2 and Cs2 multipolar coefficients c6 are fitted. They are found to be in good agreement with previous results.