Abstract
Ab initio calculations have been carried out on some potential energy curves of the (XeH)+ molecule, with particular attention paid to the lowest states. The spin-orbit interaction has been taken into account using a semi-empirical method. These calculations suggest the use of a three-state basis when dealing with H+-Xe collisions at low energies. It is also found that the computer MO correlation diagram is in good agreement with that predicted by the 'promotion model' of Barat and Lichten (1972).