Interaction of Ne q+ ( q = 8, 9, 10) with a Pt(110) surface

Abstract

The interaction of highly charged ions on clean metal surfaces causes the emission of secondary electrons both from the projectile and the target. Angular and energy resolved spectroscopy of the electrons being emitted from the projectile provides information about the neutralization dynamics of the ions. We investigated the systems 80 keV Ne 8+, 90 keV Ne 9+ and 150 keV Ne 10+ → Pt(110). The angle of incidence ψ was varied from 5° to 90° with respect to the surface. The electron detection angle θ with respect to the incident beam direction was varied from 10° to 180°. The Ne K-shell holes are filled during the interaction of the ion with the metal surface, giving rise to characteristic structures in the spectra of the secondary electrons which can be assigned to K-Auger processes. Variation of the detection angle θ leads to a kinematic shift of these structures because the electrons are emitted from moving projectiles. Our analysis of the Ne K-Auger electron spectra for different angles of incidence and different observation angles shows that the electron emission takes place inside the solid. At the instant of K-Auger electron emission inside the solid the projectiles are shown to have not changed their initial flight direction significantly.