Photoemission peaks, multiplet splitting

Another final-state effect which gives rise to an increase in the number of photoemission peaks is multiplet splitting. If the valence levels contain unpaired... 

Multiplet splitting of core level peaks can occur when the photoemitting atom has unpaired valence electrons. For example, consider the photoemission of an electron from an s-level. After photoionization, the remaining impaired electron will either have spin parallel or antiparallel to the unpaired valence electrons. This results in two... 

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