Cylindrical mirror analyser, CMA

The energies of the Auger electrons leaving the sample are determined in a manner similar to that employed for photoelectrons already described in chapter 2 Section 4. Modern instruments nearly always incorporate cylindrical mirror analysers (CMA) because their high transmission efficiency leads to better signal-to-noise ratios than the CHA already described. 

To measure relative partial cross sections a, it is advantageous to avoid the dependences on the polarization quantities Sj and A and on the angular distribution parameter / . This can be achieved with the experimental set-up shown in Fig. 1.16 where a cylindrical mirror analyser CMA (see Section 4.2) is used which accepts all electrons around the -direction. This corresponds to a <1>-integration in the above formula and yields... 

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