Stopping powers of rare gases for 40-200 keV rare-gas ions

Stopping power of He, Ne, Ar, Kr, and Xe were measured for He + , Ne + , Ar + , Kr + with energies in the range 40-200 keV using the ion beams from a Cockcroft and Walton type accelerator and a differently pumped gas cell. The result shows asymmetry for Z 1 and Z 2 . The author was not able to find oscillating structures for Z 1 and Z 2 because the Z points were so rough.