Photoionization of radium: Investigating manybody effects at high Z
Abstract
The total and partial photoionization cross sections, branching ratios, and photoelectron angulardistribution asymmetry parameters have been calculated for atomic radium (Z=88) for all subshells from the 7s valence shell down to the deep n=3 subshells. The relativistic randomphase approximation, the relativistic randomphase approximation modified to include relaxation effects, and the relativistic randomphase approximation modified to include relaxation effects and Auger decay were all used to determine the relative importance of various manybody effects such as interchannel coupling, core relaxation, and Auger decay. Comparisons are made between the various theoretical models and experimental data for the total cross sections. Interchannel coupling was found to be important for most subshells. Relaxation effects were found to be significant for calculations of the total cross section above the 5d threshold and to have a very large effect on the 5p partial photoionization cross section.
 Publication:

Physical Review A
 Pub Date:
 February 2000
 DOI:
 10.1103/PhysRevA.61.022717
 Bibcode:
 2000PhRvA..61b2717K
 Keywords:

 32.80.Hd;
 32.80.Fb;
 Auger effect and innershell excitation or ionization;
 Photoionization of atoms and ions