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Physical Review A

Spin effects in (6s1∕2+6p1∕2)0u+ Cs2133 weakly bound molecules analyzed by using the Lu-Fano method coupled to the improved LeRoy-Bernstein formula

Haikel Jelassi, B. Viaris de Lesegno, Laurence Pruvost, Marin Pichler, William C. Stwalley

Published Aug 5, 2008• 13 citations
Publisher

Abstract

We present an analysis of spectroscopic data concerning the long-range molecular state $(6{s}_{1∕2}+6{p}_{1∕2}){0}_{u}^{+}$ of $^{133}\mathrm{Cs}_{2}$ [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 $(6{s}_{1∕2}+6{p}_{3∕2}){0}_{u}^{+}$ 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.

DOI
10.1103/physreva.78.022503

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