Modelling kinetic electron emission for the impact of slow N+ on LiF

Measured total yields for kinetic electron emission (KE) from the impact of N+ ions on clean polycrystalline LiF at impact energies from the KE thresh old up to 5 keV have been modelled with the MARLOWE code for projectile tra nsport in monocrystalline LiF. Electron promotion into the continuum in bin ary collisions of neutralized projectiles with F- target anions was regarde d as the principal source of slow electron production in the target bulk. W ith a simple transport model for these slow electrons, we have calculated t otal electron yields that are typically a factor of five smaller than the r espective experimental data. This discrepancy can probably be removed by re garding additional electron production due to recoiling F- anions and diffe rent electron escape conditions for mono- and polycrystalline LiF. (C) 1998 Elsevier Science B.V. All rights reserved.