AU, AG AND AG AU SAMPLES, STUDIED USING ELASTIC PEAK ELECTRON-SPECTROSCOPY (EPES) AND COMPUTER-SIMULATION/

The backscattered electrons are detected on the energy range 100 eV to 2000 eV. A performant Monte-Carlo program is used to support the inte rpretation of the results obtained with a retarding field analyser, fr om Ag and Au samples. Computer simulation is in good agreement with th e experiment. Depth penetration study by the computer calculation indi cates that, only the two first layers contribute for the main in the b ackscattering process. In EPFS spectroscopy, the fundamental parameter is the percentage eta(e) of the elastically reflected electrons. The objective of this study was to differentiate three kinds of Au - Ag st ructures. That has been put in evidence by measurements Of eta(e) at d ifferent primary energies Ep. We have also investigated a sharp interf ace Ag(200 A-degrees)/Au(500 A-degrees), using a sputtering argon ion gun and a CMA apparatus. The position of the interface is well marked with a precision of two monolayers, while the Auger profile of the sam e sample shows eight monolayers as interface. As a matter of fact, EPE S is a high sensitive method of surface analysis.