Electron-ion recombination in the close-coupling approximation

A computational formalism is presented to obtain total electron-ion recombination cross sections and rate coefficients employing the close-coupling approximation for photoionization and scattering and the Bell and Seaton theory of dielectronic recombination. The results differ significantly from separate treatments of the two processes, radiative and dielectronic recombination. The R-matrix method, as developed for the Opacity Project, is used and results are presented for recombination collision strengths and rate coefficients for boronlike 0 2 + and Ne 4 +. The total rate of electron-ion recombination is impor tant in the determination of the ionization structure of laboratory and astrophysical plasma sources where stabil ization occurs as a balance between effective ionization and recombination. Diagnostics of nuclear fusion plas mas and spectral formation in astronomical objects re quire accurate computations for the rates of these atomic processes. Electron-ion recombination is usually con sidered as two separate processes: radiative and dielec tronic (RR and DR); the former is defined as the detailed balance inverse of the background bound-free continuum, i.e., direct photoionization (PI), and the latter as the in verse or autoionization

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