Two-electron processes in relativistic collisions of He-like uranium with gaseous targets

The simultaneous excitation-ionization and excitation-capture processes in collisions of 223 MeV/u He-like uranium ions with heavy target atoms are id entified by measuring the X-ray (L-->K) transitions in coincidence with pro jectiles undergoing charge exchange. The state selective cross sections for the population of the L-shell sub-levels of the projectile are determined, and in the case of excitation-ionization data compared to the detailed rel ativistic calculations. It is emphasized that the experimental data can ser ve as an important benchmark of the independent particle approximation and fully relativistic perturbative models, for the domain of relativistic ion- atom collisions.