Electron Ejection from Metals due to 1- to 10-keV Noble Gas Ion Bombardment. I. Polycrystalline Materials

A method is described which complements present techniques and enables measurements to be made of the secondary electron emission coefficient, $\gamma$, for ions on materials for which $\gamma$ is difficult or impossible to measure by the "flashing" or heating technique. The method allows operation in a high-vacuum (${10}^{-8\mathrm{}}$ Torr) system as opposed to an ultra-high vacuum (${10}^{-9\mathrm{}}$ Torr) system. Results for the secondary electron emission coefficient, $\gamma$, are presented for ${\mathrm{Ar}}^{+}$ on Zr, Cu, Mo, Ni, Ta, and Al, and for ${\mathrm{Ne}}^{+}$, ${\mathrm{Kr}}^{+}$, and ${\mathrm{Xe}}^{+}$ on Cu and Mo in the energy range 0.5 to 10.0 keV. Comparisons with present theories and with other experimental results are made.