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Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements IV. Relativistic calculations for C IV and C V for UV and X-ray modeling | | Sultana N. Nahar
; Anil K. Pradhan
; Hong Lin Zhang
; | | Date: |
28 Mar 2000 | | Journal: | Astrophys.J.Suppl. 131 (2000) 375-390 | | Subject: | Astrophysics; Atomic Physics | astro-ph physics.atom-ph | | Affiliation: | Department of Astronomy, The Ohio State University), and Hong Lin Zhang (Los Alamos National Laboratory | | Abstract: | The first complete set of unified cross sections and rate coefficients are calculated for photoionization and recombination of He- and Li-like ions using the relativistic Breit-Pauli R-matrix method. We present total, unified (e + ion) recombination rate coefficients for (e + C VI ---> C V) and (e + C V longrightarrow C IV) including fine structure. Level-specific recombination rate coefficients up to the n = 10 levels are also obtained for the first time; these differ considerably from the approximate rates currently available. Applications to recombination-cascade coefficients in X-ray spectral models of K-alpha emission from the important He-like ions is pointed out. The overall uncertainty in the total recombination rates should not exceed 10-20%. Ionization fractions for Carbon are recomputed in the coronal approximation using the new rates. The present (e + ion) recombination rate coefficients are compared with several sets of available data, including previous LS coupling results, and `experimentally derived’ rate coefficients. The role of relativistic fine structure, resolution of resonances, radiation damping, and interference effects is discussed. Two general features of recombination rates are noted: (i) the non-resonant (radiative recombination) peak as E,T ---> 0, and the (ii) the high-T resonant (di-electronic recombination) peak. | | Source: | arXiv, astro-ph/0003411 | | Services: | Forum | Review | PDF | Favorites | |
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