Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. XII. Na IX, Na X, Mg X, and Mg XI for Ultraviolet and X-Ray Modeling

Details Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. XII. Na IX, Na X, Mg X, and Mg XI for Ultraviolet and X-Ray Modeling Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. XII. Na IX, Na X, Mg X, and Mg XI for Ultraviolet and X-Ray Modeling

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apjs..167..315n&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 167, Issue 2, pp. 315-333.

Astronomy and Astrophysics

Astronomy

Atomic Processes, Line: Formation, X-Rays: General

Scientific paper

Detailed study on the inverse processes of photoionization and electron-ion recombination for Na IX+hν<-->Na X+e, Na X+hν<-->Na XI+e, Mg X+hν<-->Mg XI+e, and Mg XI+hν<-->Mg XII+e is reported. The unified method for the total electron-ion recombination is used for the self-consistent results of total and level-specific recombination rate coefficients αR and αR(i) (subsuming both radiative recombination [RR] and dielectronic recombination [DR]), total recombination cross sections σRC, and total and partial level-specific photoionzation cross sections σPI and σPI(g). The total recombination spectrum of cross sections and recombination rates versus photoelectron energy are presented for experimental applications. The unified method employs close-coupling approximation in the relativistic Breit-Pauli R-matrix (BPRM) method. The coupled channel wave function expansions for Li-like Na IX and Mg X consist of 17 core levels with excitations up to 3d orbital and for He-like Na X and Mg XI consist of 16 core levels of excitations up to 4f orbital, respectively. The results are presented for all fine-structure levels of the ions up to n<=10, which correspond to 98 levels with 1/2<=J<=17/2 for Li-like Na IX and Mg X, 182 and 185 levels with 0<=J<=10 for He-like Na X and Mg XI, respectively. The level specific photoionization cross sections σPI(nSLJ) and recombination rates αR(T nSLJ) are obtained for the first time for these ions. The single-valued total αR(T) is presented over an extended temperature range for astrophysical and laboratory plasma applications. The total unified αR(T) for all ions agrees very well with the available published RR and DR rates. Total recombination rates for H-like Na XI and Mg XII are also presented for completeness. The results are expected to be accurate within 10%-15% from considerations of important atomic effects such as radiation damping, channel couplings, and interference of DR and RR. The comprehensive data sets are applicable for ionization balance and recombination-cascade models for UV and X-ray lines.

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