Five-body calculations of D-2 fragmentation by Xe19+ impact

A five-body classical trajectory Monte Carlo model has been developed to st udy fragmentation of diatomic molecules after double electron removal by hi ghly charged ion impact. A systematic study of the final-state deuteron ene rgy and momentum spectra has been conducted for Xe19+ + D-2 collisions at i mpact energies ranging from 1 eV/u to 100 keV/u. At the highest projectile energies, the fragment energies and momenta are determined by the Coulomb e xplosion of the doubly-ionized molecule via the known Franck-Condon transit ion for the isolated molecule. The deuterons are emitted back-to-hack with nearly equal energies. At the lowest projectile energies, the final state b ehavior is due mainly to the collisional momentum transfer from the slow-mo ving projectile. The deuterons are strongly scattered in the direction oppo site to the transverse momentum of the projectile with energies far greater than those produced in the Franck-Condon transition. At energies around 15 0 eV/u, both slow and fast deuterons are predicted. This is due to the vect or addition of the collisional momentum transfer to the center of mass of t he molecule with that due to the two-body Coulomb breakup of the dissociati ng ions. [S1050-2947(99)01009-4].