Photoionization and Electron-Ion Recombination: Fe XVII, S XIV AND S XV Using Unified Method

Details Photoionization and Electron-Ion Recombination: Fe XVII, S XIV AND S XV Using Unified Method Photoionization and Electron-Ion Recombination: Fe XVII, S XIV AND S XV Using Unified Method

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..dmp.i6002n&link_type=abstract

American Physical Society, 39th Annual Meeting of the APS Division of Atomic, Molecular, and Optical Physics, May 27-31, 2008, a

Physics

Scientific paper

New results on photoionization and electron-ion recombination from unified method for Fe XVII, S XIV, and S XV will be reported. The unified method, based on close-coupling approximation and R-matrix method, (i) subsumes both the radiative and dielectronic recombinations and (ii) provides self-consistent sets of photoionization and recombination cross sections, σPI and σRC. Important features will be illustrated for level-specific total and partial photoionization cross sections, total and level-specific recombination rate coefficients, such as of diagnostic w, x, y, z X-ray lines of S XV and ultraviolet lines of S XIV observed in astrophysical spectra. Results are obtained for the first time for fine structure levels with n <=10 and 0 <=l <=9 which are 98 levels of S XIV of total angular momenta 1/2 <=J <= 17/2 and 188 levels of S XV of 0 <=J <=10. Total recombination rates agree well with the available rates. σPI of Fe XVII for hundreds of fine structure levels being calculated using relativistic Breit-Pauli R-matrix method will also be reported. The wavefunction includes ground and 59 core excitations of n=2 and 3 complexes. Impact of n=3 core excitations will be illustrated.

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