A STUDY AT HIGH ENERGY-RESOLUTION AND AT LOW PRIMARY ENERGIES OF THE SECONDARY ELECTRON EMISSION FROM (100) TUNGSTEN.
ILLINOIS UNIV URBANA COORDINATED SCIENCE LAB
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An apparatus was designed and constructed to study secondary electron emission at low primary energies 0-50 eV. Secondary energy distribution and elastic-and-inelastic reflection data are presented for primary electrons incident on both clean and gas-covered 100 tungsten. Structure in the elastic and inelastic reflection data are found to be associated with the band structure of the target. Discrete energy loss structure due to the excitation of vibrational levels of gas complexes adsorbed on the target is found in the region just beneath the elastic peak for primary energies between 1.0 and 10.0 eV. Various adsorbed gases are found to give rise to different spectra of discrete energy losses. The constant shape and location of the energy distribution of the elastic peak over the primary energy range 3.0 to 70.0 eV shows that shifting or broadening of the peak due to phonon excitation must be less than 10 meV over this entire energy range.
- Electricity and Magnetism
- Nuclear Physics and Elementary Particle Physics