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: This email address is being protected from spambots. You need JavaScript enabled to view it.
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.
© EDP Sciences, Springer-Verlag, 2009
