CASCADE EFFECTS ON THE AR LMM AUGER SPECTRUM

Generally, at excitation energies well above inner-shell ionization th resholds, Auger spectra are independent of the method of excitation. A notable exception to this has been found for the Ar L2,3MM Auger spec tra where different results are obtained via electron-impact ionizatio n at 2 and 4.5 keV and photoionization below the K edge at 3.17 and 2. 2 keV. The differences are explained by the variation of the contribut ion of L1 to L2,3 Vacancy transfers with the mode of excitation. Calcu lations using a simple vacancy transfer model explain the observed spe ctra.