Dissociation of Fast H⁺₂-molecular ions in grazing surface collisions

Abstract

The dissociation of H: -molecules with energies ranging from 0.4 to 1.6 MeV in grazing collisions with a clean and atomically flat W(100)-surface is investigated by spectroscopy of the energy of the dissociated fragments. We observe two peaks in the energy spectra which result from the Coulomb explosion in longitudinal direction during surface scattering. Intensities and widths of both peaks are clearly different and depend strongly on the angle of scattering.

Dissociative scattering of fastHeH+ions at glancing-angle incidence on a crystal surface

“…They tend to be parallel to the surface during the dissociation under the influence of the surface continuum potential. Similar experimental studies have been reported by Winter, Poizat, and Remillieux, where the energy of the fragments is measured with a high-resolution electrostatic spectrometer [5].…”