Theoretical studies of the interaction of He²⁺with H(1s) and H⁺with He⁺

Abstract

Cross sections calculated using an atomic basis are presented for the charge exchange reaction He2++H(1s) to He+(nl)+H+ for states with n<or=3. Excitation and ionisation cross sections for He2+ impact on atomic hydrogen are calculated within a model using expansions into both atomic states and pseudostates. A two-centre expansion using the same basis is applied to the reaction H++He+(1s) to H+He2+ and results are obtained in harmony with experiment and with calculations using alternative basis sets.