Portland State University. Department of Physics
Date of Award
Master of Science (M.S.) in Physics
1 online resource (vi, 50 leaves)
Electron beams, Electrons -- Scattering, Electron optics
The energy distribution in an electron beam transmitted by a thin aluminum film was studied by a retarding potential method in which the energy analysis could be made as a function of the polar angle and azimuth of scattering. The results indicated that the transmitted beam contained electrons which had lost essentially zero energy and groups of electrons which had suffered losses of approximately15 ev and 25 ev and possib1y 75 ev. In addition there appeared to be a continuous background of energy losses over the range studied (from 0 to 80 ev). The resolution of the energy analyser was limited by the separation of the data points and was not adequate to observe the dependence of the 15 ev energy loss (plasma loss) on the polar angle of scattering. This study demonstrated the feasibility of this method of energy analysis as well as the short-comings of the apparatus. Suggestions for future improvements are made.
Stewart, John Patrick, "A method of measuring the electron energy losses in transmission through thin films" (1969). Dissertations and Theses. Paper 908.