Energy and angular distributions of backscattered electrons from the collision of 8-keV electrons with a thick tungsten target

The energy and angular distributions of backscattered electrons produced under impact of 8.0-keV electrons with a thick tungsten target are measured. The energy range of backscattered electrons is considered between 70 and 1700 eV. The angle of incidence α and the takeoff angle θ are chosen to have values α=0°, 10°, and 20° and θ=110°, 120°, and 130°, respectively. The energy distribution function exhibits two sharp peaks, which are found to appear at 216 and 548 eV. They are identified as Auger peaks of tungsten arising due to electron transitions 4d-6s6p and 4s-6s6p, respectively. The measured energy spectra are compared with two different theoretical models. The theoretical predictions are found to yield a good agreement with the experiment in the considered energy range of the backscattered electrons.