https://doi.org/10.1140/epjst/e2009-00968-9
Double K-shell photoionization of low-Z atoms and He-like ions
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
Corresponding author: joanna.hoszowska@unifr.ch
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.
© EDP Sciences, Springer-Verlag, 2009
