Resonant transfer and excitation for U sup 90+ projectiles in hydrogen

Resonant transfer and excitation (RTE), resulting from simultaneous electron capture and {ital K}-shell excitation in a single collision, has been measured for 97--150 MeV/u U{sup 90+} ions in hydrogen. Distinct maxima, attributed to RTE contributions from the formation of intermediate excited states, were observed superimposed on a monotonically decreasing background due to single-electron capture. This measurement, the first for a very heavy projectile, provides a test of relativistic dielectronic-recombination theory.