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Title:
Iron ionization and recombination rates and ionization equilibrium
Authors:
Arnaud, M.; Raymond, J.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 398, no. 1, p. 394-406. (ApJ Homepage)
Publication Date:
10/1992
Category:
Atomic and Molecular Physics
Origin:
STI
NASA/STI Keywords:
IONIZATION CROSS SECTIONS, IRON, METAL IONS, RECOMBINATION REACTIONS, ABUNDANCE, ELECTRON IMPACT, INTERSTELLAR CHEMISTRY
DOI:
10.1086/171864
Bibliographic Code:
1992ApJ...398..394A

Abstract

In the past few years important progress has been made on the knowledge of ionization and recombination rates of iron, an astrophysically abundant heavy element and a major impurity in laboratory fusion devices. We make a critical review of the existing data on ionization and dielectronic recombination and present new computations of radiative recombination rate coefficients of Fe(+14) through Fe(+25) using the photoionization cross sections of Clark et al. (1986). We provide analytical fits to the recommended data (direct ionization and excitation-autoionization cross sections; radiative and dielectronic recombination rate coefficients). Finally we determine the iron ionic fractions at ionization equilibrium and compare them with previous computations as well as with observational data.

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