ISOTOPE EFFECT IN COLLISION BETWEEN HELIUM ATOM AND HYDROGEN MOLECULE

Rotationally inelastic He-H-2, D-2, T-2 collision was studied quantum- mechanically. Converged cross sections were calculated by using the cl ose coupling method for relative kinetic energies of 0.01 to 0.54 eV. Born-Oppenheimer approximation was employed to determine the potential surface of He-D-2, He-T-2, and Re-H-2. Careful comparison between the cross sections of the isotopically substituted systems was carried ou t, and the regular changes of the total cross sections of the isotopic ally substituted He-H-2 colliding systems were obtained.