Stopping of 1-2 keV/amu Hydrogen Ions in Solid N_2

Thin films of N2 on a substrate of solid Xe were bombarded with 1–2 keV/amu H1+, H2+, and H3+ ions, and the energy spectra for those positive ions backscattered through 135° were measured. The minimum energy loss of particles scattered from the Xe-surface was found to vary linearly with film thickness up to typically ∼ 150 Å, where multiple collision effects become important.

It is argued that stopping powers for solid N2 may be extracted from these measurements.Existing stopping powers for gaseous N2 are about twice as large as our results.