The Relative Secondary Electron Emission Due to He, Ne, and A Ions Bombarding a Hot Nickel Target

Abstract

The number of electrons emitted per positive ion from a degassed Ni target bombarded by He, Ne, and A ions was measured. For He, in an energy range from 450 to 1650 ev the emission increased from 49 to 107 percent; for Ne having energies from 900 to 1275 ev the increase was 43 to 57 percent; for A of 680 to 1480 ev from 11 to 18 percent. These results confirmed those found earlier for $\mathrm{H}_2^{}{}_{}{}^{+}$ and $\mathrm{D}_2^{}{}_{}{}^{+}$ ions in showing a smaller emission for the heavier ion at the same energy. Similarly, the percentage of positive ions reflected increased with the energy of the primary ions and was smaller for the heavier ions.