Abstract
A new coincidence electron-scattering spectrometer for electron momentum spectroscopy (EMS) experiments is described. The new features include the use of a single 360° cylindrical mirror analyzer (CMA) for energy analysis and a coincidence data acquisition system based on a qVt-multichannel analyser and CAMAC electronics. The CMA energy resolution and coincidence time resolution are 0.32 ± 0.03% ΔE/E fwhm and 3.5 ± 0.5 ns fwhm, respectively. The helium 1s orbital binding energy spectrum is obtained at 1000 eV binding energy and 100 eV pass energy, yielding a coincidence binding energy resolution of 1.5 ± 0.2 eV fwhm. The coincidence data analysis procedure that is introduced provides experimental verification of some basic statistics of coincidence counting.
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