X-ray emission following eow-energy charge exchange collisions of highly charged ions

K-shell x-ray emission following low-energy charge exchange collisions (les s than or equal to 11 eV/amu) has been measured for ten ban and hydrogenic ions up to U91+. The data resolve capture into angular momentum states with l = 1 and provide a stringent test of theory. The assumption of Stark mixi ng of angular momentum states is inappropriate at such energies. Results fr om detailed calculations give a better description of the data, but signifi cant discrepancies are noted. The measurements show that the hardness ratio of charge-exchange induced K-shell x-ray emission represents a diagnostic of the dynamics of ion-atom interactions in situations where the energy is below 1 keV/amu, e.g,, in solar wind collisions.