HYPOCYCLOIDAL ELECTRON SPECTROMETER FOR STUDYING ELASTIC AND INELASTIC ELECTRON BACKSCATTERING FROM ATOMS, MOLECULES, AND SOLID-SURFACES

A design of the electron backscattering spectrometer for studying elas tic and inelastic electron scattering from atoms, molecules, and solid surfaces is described. Electrons are monochromatized and analyzed wit h respect to energy in the crossed uniform longitudinal magnetic and n onuniform transverse electric fields. The spectrometer design and prin ciple of the electron acquisition and analysis by energies and angles are described in detail. The spectrometer operation modes involving me asurements of the energy dependences of the elastic electron scatterin g at 180 degrees, electron energy loss spectra, constant residual ener gy spectra, and the energy dependence of the elastic and inelastic cro ss sections are illustrated by data on the electron-surface interactio ns.