Subject: XPS peak fitting with satellite peaks
I am currently working on peak fitting Sn3d spectra that include satellite peaks (see attached figure). My aim is to calculate oxide thickness by calculating the ratio of main peak areas to the oxide peak areas and to understand the change in oxide thickness as a function of the duration for which my sample (FeSn) is exposed to oxygen. My question would be, are the satellite peaks tied to the main peaks? If so, must their areas be included while calculating oxide thickness?
Context of the figure: Sn3d spectra for photon energy of 800eV. Not shifted and not calibrated yet. (1) are the main Sn3d peaks, (2) are the oxide peaks (3) are the Fe-Sn bond peaks. Oxygen peak (O1s) occurring at roughly 530eV is not fitted yet.
Dear Sadhana Sridhar,
Shake up and shake off sattelite structures can be explained by the sudden approximation for XPS. According to this approximation your main peak is (often) the most relaxed final state of many possible final states which all account for the transition. Note that according to a sum rule the center of gravity for the intensity ends up at the Koopmans energy. So all the shake up and shake offs should then be accounted for. Usually the intensity is less the furhter away from the main peak so at some point it is reasnable to not take it into account.
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