Authors: M. Gonin, R. Kallenbach, P. Bochsler, and A. Bürgi,
Reference: Nucl. Instr. and Meth. B101 (1995), 313-320.
We experimentally investigate charge exchange of ions passing through thin carbon foils of 1.1-10 mu gm cm-2 thinkness at incident energies from 0.5 to 5 keV/u. At such low energies usually only the charge exchange processes occurring at the back surface determine the final charge state of the emerging projectiles. However, for some elements we observe a significant foil thickness dependence which cannot be explained by current models. Possible reasons for this thickness dependence are discussed in this paper. We further present new data on charge state yields for Mg, Ca, Ti, Cr, and Ni.