Auger Electron Emission from Metals Induced by Low Energy Ion Bombardment: Effect of the Band Structure and Fermi Edge Singularity

Calculations of the kinetic energy distributions of electrons ejected from plane metal surfaces by Auger neutralization of slow monoatomicions are reported. A many body theory is used that includes both the band structure of the target material and the Fermi singularresponse of metal electrons (to the sudden neutralization of the projectile). Application is made to experiments of electron emission frompolycrystalline Al by Ar+-ions, at varying incident energies and angles. Adjustment of the broadening parameters of the distribution ofshake-up electrons leads to excellent agreement between the theory and the measurements.