I'm attempting to fit Cl2p XPS peak using casaXPS, where I expect it to exist in two different chemical states. Hence, the fitting includes a pair of doublets (total of four peaks).  The constraints that one would naturally apply in this case are; 

  • Position of doublets. Pos(Cl2p1/2) = Pos(Cl2p3/2)+1.6 eV
  • Area of doublets. Area(Cl2p1/2) = Area (Cl2p3/2) * 0.5

I was wondering whether the FWHM should be constrained to be equal for the doublet of the same chemical state? 

Any information of a range of expected FWHM of Cl2p peaks is also appreciated. 

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