Аннотация:The objective of this study was to obtain elastic and inelastic cross sections for the excited Ar atom on He in the ground state from calculated potential energy curves and nondiagonal matrix elements. The calculations of potential energy curves, spin–orbit interactions, and nonadiabatic coupling matrix elements were carried out using the MOLPRO 2015 electronic structure program for a total of 49 spin–orbit states. On their base inelastic scattering cross sections were calculated using the exponential Born distorted wave approach (EBDW). The calculated cross sections and rate constants for inelastic processes can be employed in the calculation of dynamics nonradiative transitions.