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A new global potential energy surface (PES) for the ground electronic state (12A) of the Ar+H2+→ArH++H reaction has been constructed by multi-reference configuration interaction method (MRCI) with Davidson correction and a basis set of aug-cc-pVQZ.Using 6080 ab initio single-point energies of all the regions for the dynamics, a many-body expansion function form has been used to fit these points.