Near-threshold photoionization of hydrogenlike uranium studied in ion-atom collisions via the time-reversed process

Radiative electron capture, the time-reversed photoionization process occurring in ion-atom collisions, provides presently the only access to photoionization studies for highly charged ions. By applying the deceleration mode of the ESR storage ring, we studied this process in low-energy collisions of bare uranium ions with low-Z target atoms. This technique allows us to extend the current information about photoionization to much lower energies than those accessible for neutral heavy elements in the direct reaction channel. The results obtained for the ground and first excited states prove that for high-Z systems, higher-order multipole contributions and magnetic corrections persist even at energies close to the threshold. (orig.)Available from TIB Hannover: RO 801(2000-30) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman