Abstract
In this paper we present photoionization cross sections for the lowest five states of Olike S IX (1s(2)2s(2)2p(4) P3(0,1,2), D1(2), S1(0)). The relativistic BreitPauli Rmatrix codes were utilized including all terms of the 2s(2)2p(3), 2s2p(4), 2p(5), 2s(2)2p(2)3s, 3p, 3d and 2s2p(3)3s, 3p, 3d configurations in the expansion of the collision wavefunction for S X. It was also found that to achieve convergence of the lowlying energy separations of the target levels, an additional 21 configuration functions needed to be included in the configuration interaction expansion, incorporating twoelectron excitations from the 2s and 2p shells to the 3s, 3p and 3d shells. The present work thus constitutes the most sophisticated photoionization evaluation for ground and metastable levels of the S IX ion. Direct comparisons have been made with the only available data found on the OPENADAS database between level resolved contributions of the spectrum. This comparison for the background cross section exhibits excellent agreement at all photon energies for each partial photoionization cross section contribution investigated. Finally, the autoionizing bound states arising from numerous open channels have also been investigated and identified using the QB approach, a procedure for analyzing resonances in atomic and molecular collision theory which exploits the analytic properties of Rmatrix theory. Major Rydberg resonance series are also presented and tabulated for the dominant linewidths considered.
Original language  English 

Article number  155204 
Number of pages  10 
Journal  Journal of Physics B: Atomic, Molecular and Optical Physics 
Volume  48 
Issue number  15 
DOIs  
Publication status  Published  14 Aug 2015 
ASJC Scopus subject areas
 Condensed Matter Physics
 Atomic and Molecular Physics, and Optics
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Catherine Ramsbottom
Person: Academic