On the 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. Ar 2+ ions are also produced and, over the range of collision energies investigated, the cross section for production of Ar 2+ is approximately 20% of that for Ar + formation.