Polarization of Electrons by Scattering, III Reflection-Transmission Effect

Abstract

With electrons obliquely incident on a foil the intensities of the electrons scattered through a certain angle are different on the reflecting and on the transmitting side because of the plural scattering, and this phenomenon is called the reflection-transmission effect. This effect has been measured experimentally and compared with the calculation which is only a rough estimation. The experimental results obtained are in good agreement with the calculation at energies higher than 80 keV when thin gold foils are used. Since the plural scattering greatly influences the result of electron polarization experiment, the experimental results obtained previously by one of the authors (N.R.) must be corrected from this point of view. It is interesting to compare these corrected values with the theoretical ones obtained by Bartlett and Welton and recently by Mohr considering a nuclear screening by the orbital electrons, and by Bartlett and Watson using the pure Coulomb field. The agreement between experimental results and the corrected theoretical ones is not perfect, but it may be considered to be unavoidable that there are some differences between them, if one takes into account the fact that a small change in the nuclear screening makes a considerable effect on the theoretical values.