Double photoionization of Mg and the scaling model
by
Ralf Wehlitz, Synchrotron Radiation Center Wisconsin, USA
→
Europe/Berlin
Bldg. 25f, room 456
Bldg. 25f, room 456
Description
Direct double photoionization of atoms in which two electrons are simultaneously emitted is of high interest for understanding electron correlations. Many investigations of double photoionization have focused on helium -- the textbook example for double ionization with its two electrons. Double-photoionization experiments on atoms beyond He are still sparse and often less sophisticated due to the difficult handling of the target atom. Theoretical calculations also concentrated first on He, and after achieving satisfactory agreement with experiment, the theory moved forward to slightly more complex atoms. Of particular interest are the alkaline-earth metals that are helium-like atoms in so far as they only have two outer-valence electrons while the other electrons can be approximated as spectators. Furthermore, in previous double-photoionization studies of Be and of Li a scaling model for the double-to-single photoionization ratio of He, Li, Be, and possibly H2 has been found. At the time, it was hoped that this scaling model would allow us to predict the double-to-single photoionization ratios for other elements.
This work is based upon research conducted at the Synchrotron Radiation Center, which is supported by the NSF under Grant No. DMR-0537588.
