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We investigate the possibility of forming deeply bound ultracold RbCsmolecules by a two-color photoassociation experiment. We compare the resultswith those for Rb_2 in order to understand the characteristic differencesbetween heteronuclear and homonuclear molecules. The major differences arisefrom the different long-range potential for excited states. Ultracold 85Rb and133Cs atoms colliding on the X^1Sigma+ potential curve are initiallyphotoassociated to form excited RbCs molecules in the region below the Rb(5S) +Cs(6P_1/2) asymptote. We explore the nature of the Omega=0^+ levels in thisregion, which have mixed A^1Sigma^+ and b^3Pi character. We then study thequantum dynamics of RbCs by a time-dependent wavepacket (TDWP) approach. Awavepacket is formed by exciting a few vibronic levels and is allowed topropagate on the coupled electronic potential energy curves. For a detuning of7.5 cm-1, the wavepacket for RbCs reaches the short-range region in about 13ps, which is significantly faster than for the homonuclear Rb_2 system; this ismostly because of the absence of an R^-3 long-range tail in the excited-statepotential curves for heteronuclear systems. We give a simple semiclassicalformula that relates the time taken to the long-range potential parameters. ForRbCs, in contrast to Rb_2, the excited-state wavepacket shows a substantialpeak in singlet density near the inner turning point, and this produces asignificant probability of deexcitation to form ground-state molecules bound byup to 1500 cm-1. Our analysis of the role of spin-orbit coupling concerns thecharacter of the mixed states in general and is important for bothphotoassociation and stimulated Raman deexcitation.

Stimulating the production of deeply bound RbCs molecules with laser pulses: the role of spin-orbit coupling in forming ultracold molecules