NONDISSOCIATIVE AND DISSOCIATIVE IONIZATION OF N-2, CO, CO2, AND CH4 BY IMPACT OF 50-6000 KEV PROTONS AND ANTIPROTONS

Measurements of the cross section for non-dissociative single ionizati on and the cross sections for the creation of charged fragments have b een performed for 50-6000 keV antiproton and proton impact on N-2, CO, CO2, and CH4. The results support the understanding of the ionization phenomenon that has been achieved via measurements with fundamental c harged particles on atoms. The present high-energy antiproton fragment ation data supply a stringent test of the validity of the published el ectron-impact fragmentation data which, unfortunately, most of them fa il.