Photoionization of singly and doubly charged aluminum ions in the extreme ultra violet region: Absolute cross sections and resonance structures - art. no. 052719

Absolute measurements of the photoionization cross sections of Al+ ions ran ging from 20 to 160 eV and of Al2+ ions from 70 to 105 eV have been perform ed utilizing a merged-photon-ion-beam. setup with synchrotron radiation fro m an undulator. The continuum cross sections are in good agreement with pub lished theoretical predictions. Structures resulting from excitation of val ence or inner-shell electrons are resolved, identified, and compared with a ssignments from earlier spectral measurements. The analysis of the spectra is performed with the support of multiconfigurational atomic structure calc ulations.