Electron-Ion Recombination, Photoionization and Dielectronic Satellie Lines of Ca XVIII and Ca XIX Using Unified Method

Details Electron-Ion Recombination, Photoionization and Dielectronic Satellie Lines of Ca XVIII and Ca XIX Using Unified Method Electron-Ion Recombination, Photoionization and Dielectronic Satellie Lines of Ca XVIII and Ca XIX Using Unified Method

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..dmp.p6009n&link_type=abstract

American Physical Society, 38th Annual Meeting of the Division of Atomic, Molecular, and Optical Physics, June 5-9, 2007, abstra

Physics

Scientific paper

The unified method is used to study photoionization, electron-ion recombination and dielectronic satellite (DES) lines of highly charged Ca XVIII and Ca XIX. The method which (i) subsumes both the radiative and dielectronic recombinations, (ii) provides self-consistent sets of photoionization and recombination cross sections, has been extended recently to study (iii) the DES spectra with natural profiles and blending of the lines. The method is implemented through relativistic Breit-Pauli R-matrix method using coupled channel wavefunctions. Present calculations include all fine structure levels with n <=10 and 0 <=l <=9 which correspond to 98 levels of total angular momenta 1/2 <=J <= 17/2 of Ca XVIII and 193 levels with 0 <=J <=10 of Ca XIX. Results will be presented with important features for level-specific total and partial photoionization cross sections, total and level-specific recombination rate coefficients, DES spectrum and rate coefficients. They include for He-like Ca XVIII, (i) cross sections and rates for the diagnostic w, x, y, z lines and (ii) resonance strengths and rates for the 22 KLL DES lines, and for Li-like Ca XVII, the cross sections and rates for the ultraviolet lines observed in astrophysical spectra. Comparison is made with available data.

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