K-Shell Ionization of Ag, Sn, and Au from Electron Bombardment

Cross sections for $K$-shell ionization have been measured at electron bombarding energies of 0.10, 0.15, 0.20, 0.25, 0.30, and 1.00 MeV for Ag, and of 0.20, 0.60, 0.80, 1.00, 1.20, 1.40, 1.70, and 2.00 MeV for Sn and Au. Below 0.50 MeV, the results for Ag are in excellent agreement with the relativistic calculations of Arthurs and Moiseiwitsch. For Sn at 0.20 and 0.60 MeV, where the theoretical values are available, the experimental cross sections are also in very close agreement. Although the experimental cross section for Au at 0.20 MeV is very nearly the same as the calculated result of Arthurs and Moiseiwitsch at this energy, at 0.60 MeV and higher electron energies the experimental results for Au are, on the average, about 15% lower than the values of Arthurs and Moiseiwitsch.