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The isotopic branching in the reaction He + HD(super +)(v = 0, 1, 2, 3; j=0) --> HeH(D)(super +) + D(H), over a range of translational energy (E(sub trans)) is plotted on two different ab initio potential energy surface. The isotopic branching ratio for the reaction decreases in going from v=0 to v=1 and then becomes nearly v-independent in going from v = 1 to v = 3 in both the surface.

He2H(super +1) and He2D(super +1) are examined to find their bound and quasibound states in three dimensions. This is done by using a time-dependent quantum-mechanical wave packet approach for total angular momentum.

A time-dependent quantum mechanical (TDQM) investigation of three-dimensional collisions of (H(super -), H2 (v=0,j=0) and its isotopic variants for a range of total angular momentum values is carried out on an ab initio potential-energy surface (PES), for collision energy in the range 0.3-3.0 eV, and the results obtained are compared with the experimental results.