TweetIn most cases, XPS spectra require a background correction before peak fitting can be carried out. There are 3 different types of background corrections: Linear, Shirley and tougaard. The most widely used is the Shirley background as it is more or less accurate and somehow easy to compute. The essential feature of the algorithm is the iterative determination of the background using the areas A1 and A2 to compute the background intensity SB(E) :

where k is the step in the background and is the difference between I1 and I2. The calculation of the shirley is an iterative procedure as initially A1(E) and A2(E) are unknown and have to approximated using e.g. a linear correction of the background.

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