H-ATOM EXCHANGE IN LOW-ENERGY IH (V=0)- EFFECT OF THE POTENTIAL-ENERGY SURFACE(I COLLISIONS )

The LEPS hypersurface C of Schatz, Sokolovski and Connor, which has be en devised to account for the photodetachment spectrum of the IHI- ani on, is assumed in the present study of the dynamics of the I2H system. The calculation involves our previous proposed Born-Oppenheimer-type separation between the light and heavy nuclear motions. This method en ables one to explain the previous photodetachment results and to provi de state-to-state H-atom-exchange cross sections in low-energy IH (v=0 ) + I collisions. These two processes exhibit common features that are related to the topology of the electronic hypersurface.