PROJECTILE L(2,3)-SHELL ELECTRON-EXCITATION IN SLOW NE-AL COLLISIONS()

We report angle-resolved studies of projectile L(2,3)-shell autoioniza tion electron emission by bombarding a polycrystalline Al surface with 0.2-5-keV Ne+ ions. Several previously unresolved transition lines ha ve been observed and assignment to Ne 2p(3)nln'l'n''l'' and Ne+ 2p (3) nln'l' autoionizing states has been proposed. We found that the P-3 tr iplet is the dominant configuration for the excited Ne 2p(4)3s(2) and its relative population depends sensitively on both the primary ion en ergy and incidence angle. Analysis of the electron spectra shows that most excited Ne particles are backscattered from the surface and decay in vacuum, rather than inside the solid.