Fragmentation of H-2 and HD molecules by C6+ impact

A five-body classical trajectory Monte Carlo model has been developed to st udy fragmentation of Ha and HD after double electron removal collisions by highly charged ions. The theoretical model includes all two-body Coulomb in teractions in the post-collision regime. A systematic study of the energy p artitioning between the nuclei has been made for C6+ impact from 1 eV/u to 1 MeV/u. Major deviation from isolated molecule Franck-Condon behavior is f ound for impact energies E less than or equal to 1 keV/u. At the lowest imp act energies the target ions are very energetic with a strong contribution being from collisional transfer from the projectile The target ion energy s pectra at high impact energy is due to the Coulomb explosion of the isolate d doubly ionized molecule in the known Franck-Condon transition, resulting in a distinct separation of the energy peaks for the HD isotope. At energie s around 10 eV/u to 1 keV/u, or projectile charge divided by speed of q/v a pproximate to 30-300, both slow and fast target ions are observed which res ult from the competition between the momentum transfered during the collisi on with that from the Coulomb dissociation of the two ions.