Efficient formation of strongly bound ultracold caesium molecules by photoassociation with tunnelling

M. Vatasescu¹, C. M. Dion², and O. Dulieu³

¹Institute of Space Sciences, MG-23, RO-77125, Magurele-Bucharest, Romania
²Department of Physics, Umeå University, SE-901 87 Umeå, Sweden
³Laboratoire Aimé Cotton, CNRS, Bâtiment 505, Univ. Paris-Sud, 91405 Orsay Cedex, France

We calculate the rates of formation and detection of ultracold Cs₂ molecules obtained from the photoassociation of ultracold atoms through the double-well 0_g^-(6S_1/2 + 6P_3/2) state. We concentrate on two features previously observed experimentally and attributed to tunnelling between the two wells [Vatasescu et al 2000 Phys. Rev. A 61 044701]. We show that the molecules obtained are in strongly bound levels (v''=5,6) of the metastable a³Sigma_u⁺(6S_1/2 + 6S_1/2) ground electronic state.

This article has been published in the Journal of Physics B 39, S945 (2006) and may be found at http://stacks.iop.org/0953-4075/39/S945.

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