ISOTOPE VARIATIONS OF EXCHANGE AND DISSOCIATION REACTIONS IN COLLINEAR HE-2(+) COLLISIONS(H)

An accurate quantum mechanical calculation is made for collinear He H-2(+) collisions on a realistic potential energy 2 surface at energie s above the dissociation threshold. The isotope variations He-4 + H-2( +), He-3 + HT+, He-3 + TH+, He-3 + T-2(+), and He-3 + MuT(+) are consi dered, and the importance of mass factors in the competition between t he exchange and dissociation processes is discussed.