2-ELECTRON PROCESSES IN THE IONIZATION OF H-2 AND D-2 BY FAST PROTONS

Measurements on dissociative ionization of H-2 and D-2 by fast (16-25 MeV) protons are carried out in an effort to understand two-electron p rocesses in collisional ionization. The high velocity limit of the rat io of cross sections, R, of two-electron processes to one-electron pro cesses obtained from these measurements along with earlier data is use d to obtain a universal scaling law for R as a Function of projectile charge and energy, irrespective of the sign of the projectile charge.