Détermination par spectroscopie auger, des sections efficaces d'ionisation de la couche L 23 du magnésium et de l'aluminium sous impact d'ions He +

Abstract

The L 23 Mg and L 23 Al Auger spectra excited by helium-ion bombardment have been studied. These spectra essentially show an intensive peak interpreted in terms of L 23 MM atomic-like and L 23 VV transitions. By integration of this peak, the Auger emission cross sections were determined and their variations as a function of the incident particle energy were studied from a few keV up to 100 keV. These results have been compared to the values of the ionization cross sections calculated in a classical binary encounter approximation (BEA). One observed a good agreement for the aluminium target. For the magnesium, the discrepancy in the low energy range shows that, in those case, the electronic promotion in a molecular orbital model added at the electronic excitation due to the direct Coulomb interaction.