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Recombination line spectroscopy: the O II spectrum

Published online by Cambridge University Press:  15 December 2006

Robert J. Bastin  and
Peter J. Storey
Robert J. Bastin
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, LONDON WC1E 6BT, UK email: pjs@star.ucl.ac.uk
Peter J. Storey
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, LONDON WC1E 6BT, UK email: pjs@star.ucl.ac.uk
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Abstract

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We describe a theoretical treatment of the recombination spectrum of O II. The ab initio calculations are carried out in intermediate coupling which allows the distribution of population among the 3P$_J$ ground levels of O$^{2+}$ to be correctly incorporated for the first time. The effects of dielectronic recombination due to states lying between the 3P$_J$ levels is also included. The new theory allows the strongest O II recombination lines to be used as a diagnostic of the temperature and density of the emitting region and illustrative examples are given.

Keywords

atomic processestechniques: spectroscopic