Single- and double-electron capture in He2+He collisions and single-electron capture in He++He+collisions

Single- and double-electron capture in He 2+ +He collisions and single-electron capture in He + +He + collisions are studied systematically using a travelling molecular orbital (MO) method within a semiclassical formalism. Present results identify the origin of the discrepancy seen between theoretical results previously obtained for He + +He + collisions and give a theoretical rationale to the low-energy behaviour of cross sections for the single-electron capture process in He 2+ +He collisions previously observed experimentally.