RADIATIVE ELECTRON-CAPTURE BY HIGH-ENERGY OXYGEN IONS IN HYDROGEN ANDHELIUM

X rays produced in the collisions of 94-222-MeV O8+ ions with H-2 and He targets have been measured. Resulting spectra have been analyzed to determine absolute yields, profile widths, and energies for x rays em itted in the process of radiative electron capture (REC). These measur ements are compared with predictions based on impulse-approximation ca lculations, using differential cross sections for radiative recombinat ion (RR) folded with target Compton profiles. Measured absolute peak e nergy positions and profiles are found to be in good agreement with th ese simple theoretical estimates. Cross sections derived from REC yiel ds are compared with other measurements and with theoretical RR values . A small systematic discrepancy between experimental and theoretical cross sections is noted.