The cross sections of various channels of the process of formation of free electrons occurring during adiabatic collisions of He²⁺ with xenon atoms Xe(5s²5p⁶¹S), that is, at velocities significantly lower than the velocities of electrons in the target atom outer shell, have been calculated. The dependences of the cross sections for direct ionization (DI) and quasi-molecular ionization or Auger ionization (QA) on the kinetic energy of the resulting electrons and the distance of approach of atomic particles at the moment of ionization have been determined. The calculated values of the cross sections of these ionization channels are compared with experimental data obtained from measurements of the cross sections of elementary processes of change charge states in collisions between He²⁺ and Xe. Keywords: adiabatic collisions, direct ionization, quasi-molecular autoionization, diabatic terms.

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