Isotope variations of exchange and dissociation reactions in collinear He + H2+ collisions

An accurate quantum mechanical calculation is made for collinear He + H2+ collisions on a realistic potential energy surface at energies above the dissociation threshold. The isotope variations 4He + H2+, 3He + HT+, 3He + TH+, 3He + T2+, and 3He + MuT+ are considered, and the importance of mass factors in the competition between the exchange and dissociation processes is discussed.