Stopping ratios of 50-300 keV light ions in metals

With 50-300 keV H+, 7Li+, and Be+ stopping cross sections and stopping ratios are measured for carbon, aluminium, copper, silver, and gold. The thickness of the target foils is calibrated with 100-200 keV He+. Based on this thickness calibration the stopping cross sections for H+, 7Li+, and Be+ can be measured with an error smaller than 7%. Foil experiments prove to be a very appropriate method for determining ratios of stopping cross sections. These ratios can be evaluated to a precision of 2-4%. The stopping ratios were found to be independent of the target material or the ion within 7% for most ion-target combinations, i.e. the simplified stopping function can be verified within this limit. (orig.)