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Issue A&A
Volume 389, Number 2, July II 2002
Page(s) 716 - 728
Section Atomic and molecular data
DOI http://dx.doi.org/10.1051/0004-6361:20020675



A&A 389, 716-728 (2002)
DOI: 10.1051/0004-6361:20020675

Relativistic fine structure oscillator strengths for Li-like ions: C IV - Si XII, S XIV, Ar XVI, Ca XVIII, Ti XX, Cr XXII, and Ni XXVI

S. N. Nahar

Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA

(Received 18 February 2002 / Accepted 30 April 2002 )

Abstract
Ab initio calculations including relativistic effects in the Breit-Pauli R-matrix (BPRM) method are reported for fine structure energy levels and oscillator strengths upto n = 10 and $0 \leq l \leq 9$ for 15 Li-like ions: C IV, N V, O VI, F VII, Ne VIII, Na IX, Mg X, Al XI, Si XII, S XIV, Ar XVI, Ca XIII, Ti XX, Cr XXII, and Ni XXVI. About one hundred bound fine structure energy levels of total angular momenta, $1/2 \leq J \leq 17/2$ of even and odd parities, total orbital angular momentum, $0 \leq L \leq 9$ and spin multiplicity (2S + 1) = 2, 4 are obtained for each ion. The levels provide almost 900 allowed bound-bound transitions. The BPRM method enables consideration of large set of transitions with uniform accuracy compared to the best available theoretical methods. The CC eigenfunction expansion for each ion includes the lowest 17 fine structure energy levels of the core configurations $\rm 1s^2$, $\rm 1s2s$, $\rm 1s2p$, $\rm 1s3s$, $\rm 1s3p$, and $\rm 1s3d$. The calculated energies of the ions agree with the measured values to within 1% for most levels. The transition probabilities show good agreement with the best available calculated values. The results provide the largest sets of energy levels and transition rates for the ions and are expected to be useful in the analysis of X-ray and EUV spectra from astrophysical sources.


Key words: atomic data


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© ESO 2002

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