Electron-energy Analyzer CMA

As in the CHA, therefore, scanning the deflection potential -V and recording the signal as a function of electron energy provide the distribution in energy of electrons leaving the sample surface. 

If the angular spread of the acceptance angle is Aa, the relative energy resolution of a CMA is  

Conventionally, Auger spectra are presented in the differentiated energy distribution form dN(F)/dF, rather than in the undifferentiated form N(E) used in XPS. Differentiating enhances the visibility of Auger features, as is demonstrated in Fig. 2.20, in which the differentiated spectrum from boron is shown above the corresponding N(E) spectrum. The N(E) distribution is nowadays recorded digitally, and differentiation is performed by computer. With the rapid improvement in the signal-to-noise 

Note from Fig. 2.20 that although the true position of the boron KLL Auger peak in the N(E) spectrum is at 167 eV, the position in the dN(E)/dE spectrum is taken for purely conventional reasons to be that of the negative minimum, i.e. at 175 eV. 

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