Mott electron polarimetry

Electron polarimeters based on Mott scattering are extensively used in atomic and molecular, solid state, nuclear, and high-energy physics. This use stems from the increasing realization that much additional information concerning many physical processes can be obtained through spin-dependent measurements. In this review we discuss the basic physics and application of Mott polarimetry. A number of different Mott polarimeter designs are described that illustrate the wide range of operating energies (10 eV-1 MeV) and geometries that can be used in such instruments. The calibration of Mott polarimeters is discussed together with the potential sources of systematic error that can arise and that can limit measurement accuracies. The aim is to present a comprehensive practical guide to Mott polarimetry and the capabilities of the technique

Measurement of Exchange and Spin-orbit Effects and their Interference in Elastic e-Cs Scattering at 7-eV

Leuer B, Baum G, Grau L, Niemeyer R, Raith W, Tondera M. Measurement of Exchange and Spin-orbit Effects and their Interference in Elastic e-Cs Scattering at 7-eV. Z.Phys. D. 1995;33(1):39-42.Twenty years ago a theoretical analysis showed that electron scattering by high-Z one-electron atoms might lead to interference of exchange and spin-orbit interactions at low electron energies, observable as a cross-section asymmetry if unpolarized electrons are scattered by polarized cesium atoms. By using a highly polarized cesium atomic beam, we studied exchange and spin-orbit effects at different electron energies, starting at 20 eV and going down. We observed the first distinctly non-zero interference asymmetry at 7 eV: Over the angular range of 35 to 145 degrees, it varies between +0.02 and -0.02 and goes through zero near 110 degrees being negative at larger angles