INTERACTION OF NE(Q+)(Q = 8, 9, 10) WITH A PT(110) SURFACE

The interaction of highly charged ions on clean metal surfaces causes the emission of secondary electrons both from the projectile and the t arget. Angular and energy resolved spectroscopy of the electrons being emitted from the projectile provides information about the neutraliza tion dynamics of the ions. We investigated the systems 80 keV Ne8+, 90 keV Ne9+ and 150 keV Ne10+ --> Pt(110). The angle of incidence psi wa s varied from 5-degrees to 90-degrees with respect to the surface. The electron detection angle theta with respect to the incident beam dire ction was varied from 10-degrees to 180-degrees. The Ne K-shell holes are filled during the interaction of the ion with the metal surface, g iving rise to characteristic structures in the spectra of the secondar y electrons which can be assigned to K-Auger processes. Variation of t he detection angle theta leads to a kinematic shift of these structure s because the electrons are emitted from moving projectiles. Our analy sis of the Ne K-Auger electron spectra for different angles of inciden ce and different observation angles shows that the electron emission t akes place inside the solid. At the instant of K-Auger electron emissi on inside the solid the projectiles are shown to have not changed thei r initial flight direction significantly.