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this video is an introduction to creating peak models and how they apply to xps data and during the course of this video we should provide answers to questions such as these why create a peak model in the first place how does one create a peak model what is a component and do i need to use constraints when fitting a peak model to data the first question is why do we need peak models and this is an example where a peak model is an essential part of understanding the material properties this is a sample that contains aluminium and copper and because it has been measured using an aluminium k alpha x-ray source which is very common for most lab-based systems the aluminium signal arrives only in the form of 2s and aluminium 2p and the problem is that copper 3s and copper 3p overlap with the aluminium signal and then on top of this there may be different oxidation states of aluminium or even different oxidation states of copper and in order to separate different oxidation states then a peak
