Some Low-Energy Atomic Stopping Cross Sections

The electronic stopping cross sections for protons in aluminum are reported in the energy interval 10 < E < 70 keV. Stopping cross sections below 150 keV in carbon targets for projectiles with [Formula: see text], and in aluminum targets for [Formula: see text] are reported also. The results are compared with theory and show reasonable agreement. The previously reported periodic dependence of S e on the atomic number of the projectile is also evident in the present results.