The potential energy has been calculated for the 49 lowest molecular states Ω( + /-) of the molecule RbCs within the 5-23 a0 range of internuclear distances R. Spin-orbit interactions are taken into account through a semi-empirical spin-orbit pseudo-potential added to the electrostatic Hamiltonian. Molecular spectroscopic constants have been derived for bound states in the vicinity of their (inner) well. To the best of our knowledge, the vast majority of the results presented here are the first for this molecule. Extensive tables presenting energy values versus R are available at the following address: http://lasim.univ-lyon1.fr/allouche/rbcs-so.htm.

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