Eur. Phys. J. D 39, 391-398 (2006)
https://doi.org/10.1140/epjd/e2006-00119-x

Relativistic R-matrix close-coupling calculations for photoionization of Ne-like Al IV

Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, India

Corresponding authors: ^a aloksinghjha@yahoo.co.in - ^b pkjha@physics.du.ac.in - ^c sneh@del2.vsnl.net.in

Received: 9 January 2006
Revised: 3 April 2006
Published online: 7 June 2006

Abstract

We present relativistic close-coupling photoionization calculations of Al IV using the Breit-Pauli R-matrix method to obtain photoionization cross-section of Al IV from the ground state and the lowest two J=0 (even) excited states. A multi-configuration eigenfunctions expansion of the core Al V is employed with spectroscopic configurations 2s²2p⁵, 2s2p⁶, 2s²2p⁴3s, 2s²2p⁴3p, 2s²2p⁴3d and 2s²2p⁴4s. We have included, for the first time, the lowest 68 level target states of Al V in the photoionization calculations of Al IV. Extensive configuration interaction wavefunctions are used to describe both the initial Al IV states and the final Al V states. Cross-sections are compared from three level calculations including only 2s² 2p^5 2P^o_3/2, _1/2 and 2s 2p^{6 2}S_1/2 levels of Al V. The present calculation using the lowest 68 target levels of Al V are presented for the first time and should provide reasonably complete database for practical application for photoionization cross-section for Al IV, where high-energy cross-sections along with near-threshold photoionization cross-section is required.