Double K-shell photoionization of low-Z atoms and He-like ions |
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| Authors: | J Hoszowska A S Kheifets M Berset I Bray W Cao J-Cl Dousse K Fennane M Kav?i? Y Kayser J Szlachetko M Szlachetko |
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| Institution: | (1) Physics Department, University of Fribourg, 1700 Fribourg, Switzerland;(2) Research School of Physical Sciences, Australian National University, ACT, 0200 Canberra, Australia;(3) ARC Centre for Matter-Antimatter Studies, Curtin University, WA, 6845 Perth, Australia;(4) J. Stefan Institute, 1001 Ljubljana, Slovenia;(5) European Synchrotron Radiation Facility, 38043 Grenoble, France |
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| Abstract: | We report on the investigation of the photon energy dependence of double 1s photoionization of light atoms and compare the
cross sections for hollow atom and He-like ion production. Measurements of the Kα hypersatellite x-ray spectra of Mg, Al,
and Si were carried out using the Fribourg high-resolution x-ray spectrometer installed at the ID21 and ID26 beam lines at
the ESRF. The double-to-single photoionization cross section ratios were derived as a function of the incident photon beam
energy and compared to convergent close-coupling (CCC) calculations for He-like ions. The dynamical electron-electron scattering
contribution to the DPI cross-sections was found to be more important for neutral atoms than for the He isoelectronic series. |
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