Neutralization and equilibration of highly charged argon ions at grazing incidence on a graphite surface

Journal Article · Wed May 01 04:00:00 EDT 1996 · Bulletin of the American Physical Society

DOI:https://doi.org/10.1103/PhysRevA.53.4228· OSTI ID:394116

Winecki, S; Cocke, C L; Stoeckli, M P; Fry, D ^[1]

---

1. Texas A&M Univ., College Station, TX (United States)

Final charge state distributions of argon ions, scattered grazingly from a smooth highly oriented pyrolytic graphite (HOPG) surface, have been measured as a function of initial charge state (q=4-17) and impact velocity (v=0.15-0.62 a.u.). The final charge state distribution changes strongly with the impact velocity, but is almost independent of the initial charge state. The neutralization during grazing-angle scattering is compared to the charge state equilibration experienced by ions passing through a solid (carbon foil), and these two processes seem to have common properties. A K x-ray spectrum from the K-shell vacancy decay of 51 keV Ar{sup 17+} projectiles was obtained as a function of the angle between the ion beam and the surface. First measurements of x-ray spectra in coincidence with grazingly scattered ions are reported. A simple model for argon neutralization near and below the surface is proposed. The model assumes a direct side-feeding into the Ar M-shell followed by Auger and radiative L and K-shell filling.

• Sponsoring Organization: USDOE
• OSTI ID: 394116
• Report Number(s): CONF-9605105--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ARGON IONS
BEAM NEUTRALIZATION
EQUILIBRIUM
ION COLLISIONS
PYROLYTIC CARBON
SURFACES