Heavy ion induced electron emission from solid surfaces

Measurements of low energy electron spectra and the total electron yield γ from energetic E/M > 20 keV/U ion/solid-interaction are used to obtain information on electron production and emission processes. The data for monoatomic projectile ions can be explained in the framework of current theories. Comparing the isotachic yields γ of atomic and molecular projectile ions a strong molecular effect on the total electron emission is found. It is explained by an interference on the wake potentials induced in the solid by the two Coulomb-exploding nuclear fragments. From these data the wake wavelength or the plasma frequency of the electron in the solid can be calculated. (Auth.)