Instrumentation for Precise Energy- and Angle -Resolved Secondary Electron Emission Measurements
Bulletin of the American Physical Society
The production of secondary electrons (SE) by energetic electron or ion bombardment involves multiple events including electron-electron and electron-lattice scattering. To date, the details of the mechanisms for SE production and emission are not well understood, and few accurate cross section measurements are available. Current instrumentation developed at USU has been used to measure the energy-angle resolved double differential SE cross section of elemental metals. Samples are bombarded with <20 eV to 30 keV electrons. For energy-resolved measurements, a hemispherical retarding-field analyzer is employed. A custom retarding-field Faraday cup detector, rotatable about sample position, measures the energy-angle resolved cross section. Details of instrumentation, experimental methods, and characteristic data will be presented. This work is supported by grants from the AFOSR/DURIP Program and the NASA/SEE Program.
W.Y. Chang, N. Nickles, R.E. Davies and JR. Dennison, “Instrumentation for Precise Energy- and Angle -Resolved Secondary Electron Emission Measurements,” Bull. Am. Phys. Soc. 44(1) Part I, 739 (1999). American Physical Society Four Centennial Meeting, Atlanta , GA, March 22, 1999.