ON REACTION HE++AR-]HE+(AR+)' AT LOW ENERGIES

Kinematic studies of the collision system He+ +Ar at low collision energies have confirmed that the charge-transfer process He + +Ar -> Ar+ +He is highly endothermic and can involve large momentum transfer. Ar2+ ions are also produced and, over the range of collision energies investigated, the cross section for production of Ar2+ is approximately 20% of that for Ar+ formation.