INELASTIC PROCESSES AND INTERACTION ANISOTROPY FOR H- COLLISIONS WITHH-2

Vibrationally inelastic processes which can occur in collisions of low -energy simple negative ions with diatomic molecules are studied by us ing the H--H-2 system and by applying to it the quantum treatment of t he relevant multichannel scattering theory. The unusual behavior of th e vibrationally inelastic cross sections, integral and differential, i s linked to specific features of the lowest-lying potential-energy sur face, and microscopic effects of such features on the dynamics are dis cussed in relation to what was found earlier for the H+-H-2 system.