Dissociative scattering of fast HeH+ ions at glancing-angle incidence on a crystal surface
Abstract
Kinetic energies and charge-state fractions of specularly reflected fragments have been studied at glancing-angle incidence of (0.8-2.5)-MeV HeH+ ions on a clean (001) surface of SnTe. It is shown that the kinetic energies of fragments agree well with those calculated from Coulomb repulsion of He+ and H+ fragments, while most of the outgoing fragments are bare nuclei. The final kinetic energies and charge-state fractions of fragments are explained by a computer simulation: HeH+ dissociates into fragments where at least one electron is retained in the He-H system and there follows electron loss from the fragments after most of the initial potential energy has been transferred to the kinetic energies of fragments. The cross section for dissociation of HeH+ ions in collisions with electrons at the surface is estimated to be of the order of 10-16 cm2.
- Publication:
-
Physical Review A
- Pub Date:
- January 1995
- DOI:
- 10.1103/PhysRevA.51.528
- Bibcode:
- 1995PhRvA..51..528S
- Keywords:
-
- 79.20.Rf;
- 34.50.Gb;
- 34.70.+e;
- 34.80.Gs;
- Atomic molecular and ion beam impact and interactions with surfaces;
- Electronic excitation and ionization of molecules;
- intermediate molecular states;
- Charge transfer;
- Molecular excitation and ionization by electron impact