Y. Susuki et al., DISSOCIATION OF FAST HEH-SURFACE( IONS AT GLANCING ANGLE SCATTERING FROM A CRYSTAL), Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 90(1-4), 1994, pp. 310-313
Scattered H+ fragments resulting from glancing angle incidence of MeV
HeH+ ions on the clean (001) surface of a SnTe crystal are distributed
on an ellipse in the E-phi plane, where the angle phi is measured in
the plane parallel to the surface and E is the energy of the fragment.
The kinetic energies released upon dissociation derived from the diam
eters of the ellipses are smaller than those calculated from the explo
sion of fully ionized fragments. Based on a simplified model, we have
simulated the dissociative scattering of HeH+ ions at the surface, whe
re the dissociation takes place via excitation of HeH+ ions and the ch
arges of fragments change along the trajectory. It is concluded from t
he simulation that the cross section for dissociation in HeH+-electron
collisions is of the order of 10(-16) cm2.