What is the difference between main peak and satellite peak in XPS spectrum?

I have a spectrum of Co(2p) (see attached picture) and would like to know the exact state of oxidation of Co. They are two main peaks at 785,6 eV for Co2P(3/2) and 800,9 eV for Co2P(1/2), and two...

23 August 2017 5,533 14 View