Elastic and inelastic scattering of electrons from atoms. The excitation potential and ionization potential of the mercury atom are determined from measurements of the critical accelerating potentials at which electrons lose energy by inelastic scattering in mercury vapor.
The Franck-Hertz experiment. (Image courtesy of Junior Lab staff.)
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———. "Thermionic Emissions of Electrons from Metals." In Experiments in Modern Physics. San Diego, CA: Academic Press, 1966, pp. 65-80.
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Rapior, G., K. Sengstock, and V. Baeva. "New Features of the Franck-Hertz Experiment." American Journal of Physics 74 (2006): 423-428.
Bohm, David. "Ramsauer-Townsend." In Quantum Theory. Upper Saddle River, NJ: Prentice Hall, 1951, pp. 564-573.
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Homebuilt Voltage Supply Box Schematic (PDF)