Table of Contents
Journal of Atomic, Molecular, and Optical Physics
Volume 2011, Article ID 696382, 6 pages
Research Article

Nonresonant Cross-Section, Fano-Shape Parameter and Correlation Coefficient for the Photoionization of 2s2p () in Heliumlike

Laboratory Atoms Lasers, Department of Physics, Cheikh Anta Diop University, 5005 Dakar, Senegal

Received 13 August 2010; Revised 1 November 2010; Accepted 6 December 2010

Academic Editor: Igor Bray

Copyright © 2011 Aliou Niane et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The nonresonant cross-section, Fano-shape parameter and coefficient parameter have been calculated for the photoionization of helium and heliumlike under the threshold of the residual ions. Dipole matrix elements which correspond to the transitions from to state and from state to continuum state 1sp () were determined by choosing, for the ground state, the six-parameter Hylleraas wave function including electron correlation effects and a completely screened Coulomb wave function for the continuum. Energies and widths have been determined in the diagonalization method. The results are compared with available results obtained by other theoretical approaches.