Electron-Iron Recombination Rate Coefficients and Photoionization Cross Section for S XIV and SXV for X-ray and UV modeling

Details Electron-Iron Recombination Rate Coefficients and Photoionization Cross Section for S XIV and SXV for X-ray and UV modeling Electron-Iron Recombination Rate Coefficients and Photoionization Cross Section for S XIV and SXV for X-ray and UV modeling

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008oaj.....1....1n&link_type=abstract

The Open Astronomy Journal, vol. 1, issue 1, pp. 1-26

Astronomy and Astrophysics

Astronomy

1

Visible And Ultraviolet Spectra, X-Ray Spectra, Photoionization Of Atoms And Ions

Scientific paper

The inverse process of photoionization and electron-ion recombination of (h +SXIV SXV+e) and (h +SXV SXVI +e) are studied in details using ab into unified method that provides self-consistent sets of results for these processes. Results are presented for large number of fine structure levels where n 10 and 0 l 9; 98 levels for Li-likes S XIV with 1/2 J 17/2 and 188 levels for He-like S XV with 0 J 10. Photoionization cross section, :PI, of the levels of both S XIV and SXV decay smoothly in the lower region. However, narrow and high peak autoionizing Rhydberg series resonances belonging to various excited core levels appear in the high energy region and enhance the background cross section of the excited levels. The resonance series of n=2 core levels dominate while they become weaker with higher n. The prominent feature is the enhacement of the background cross section at n=2 core thresholds due to K-shell ionization leaving the ion in excited 2p states. PI also show wide PEG (photo-excitation-of-core) resonances at the photon energies that equal to the core excitation energies, Level-specific photoionization cross sections, PI(nSLJ), and recombination rate coefficients, σRC(nSLJ),are obtained for the first time for these ions. Currently available results correspond to photoionization for 18 terms with missing features and to only total recombination rate coefficients. Present σRc(nSLJ) incorporates both the radiative recombination (RR) and dielectronic recombination (DR), and show a "bump" or "shoulder" in the high temperature region due to DR dominace. The total unified recombination rate coefficients show good agreement with the available RR, and DR rates. Recombination rates photoelectron energy are presented for the astrophysical and laboratory plasma applications. Total recombination rates for H-like S XVI are given for completeness. The The results should be accurate within 10-15% based on the unified method that includes important atomic effects such as radiation damping, channel couplings, interference of DR and RR, and relativistic fine structure effects. The comprehensive datasets are applicable for various models such as for ionization balance and recombil1ation-cascade for UV and X-ray lines.

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