Atomic data from the IRON Project

LI. Electron impact excitation of Fe IX

¹ Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
² LUTH (FRE 2462 associée au CNRS et à l'Université Paris 7), Observatoire de Paris, 92195 Meudon, France
³ Laboratoire PALMS (UMR 6627 du CNRS – Université de Rennes 1), Équipe SIMPA, Campus de Beaulieu, Université de Rennes 1, 35042 Rennes Cedex, France

Corresponding author: P. J. Storey, PJS@star.ucl.ac.uk

Received: 29 May 2002
Accepted: 23 July 2002

Abstract

We calculate collision strengths and thermally averaged collision strengths for electron excitation between the one hundred and forty energetically lowest levels of Fe⁸⁺. The scattering target is more elaborate than in any earlier work and large increases are found in the excitation rates among the levels of the 3s²3p⁵3d electron configuration due to resonance series that have not been considered previously. The implications for solar and stellar spectroscopy have been discussed elsewhere (Storey & Zeippen [CITE]). We correct some errors that were made in generating the figures given in that paper and present corrected versions.