Peak shape analysis of core level photoelectron spectra using UNIFIT for WINDOWS

Several approaches used in the peak shape analysis of core lever spectra fo r the purpose of modelling of bath peak shapes and background profiles will be discussed. A universal program is presented, which combines options for adequate modelling of the peak shapes and background, implementation of a successful numerical algorithm For an iterative non-linear parameter estima tion procedure, and a flexible as well as convenient data handling. The per formance of this program code is demonstrated by fitting a Synthesized mode l spectrum. An example for analysis of a complex experimental spectrum is p resented, too. An S 2p spectrum recorded from a MET-treated pyrite surface is successfully analyzed using the presented software and is found to be ch aracterized by five different S 2p contributions.