Analysis of a Spin-Polarized Electron Beam Using the Mott Spin Analyzer I

We developed a Mott analyzer of the spherical accelerator type, to measure the spin polarization of electrons extracted from a ferro-magnetic tip or a GaAs sample. This analyzer was designed for a low-acceleration voltage (40 kV). Inelastic scattered electrons are retarded by spherical electrodes. This paper reports on the spin polarization of electrons extracted from negative-electron affinity (NEA) GaAs. This type of Mott analyzer was found to have a few problems which require resolution.