Efficient low-energy Mott analyser in comparison with other methods for polarisation analysis

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Abstract
In the attempt to provide reliable experimental data for comparison of different methods for electron-polarisation analysis, an efficient analyser based on low-energy Mott scattering has been built and tested. By increasing the solid angle of each of the two detecting channels to about 0.2 sr, an efficiency of 4*10-5 at 15 eV was obtained; a further increase of this figure of merit is to be expected by improving the target system. The device is much more compact than a high-energy Mott analyser and its efficiency is almost comparable to that obtained by high-energy Mott scattering or low energy electron diffraction.