Atomic data from the IRON Project

XL. Electron impact excitation of the Fe  XIV EUV transitions

¹ Department of Physics and Astronomy, Gower Street, London WC1E 6BT, UK
² Department of Applied Mathematics and Theoretical Physics, Silver Street, Cambridge CB3 9EW, UK

Send offprint request to: P.J. Storey

Received: 26 April 1999
Accepted: 26 August 1999

Abstract

We calculate collision strengths and thermally averaged collision strengths for electron excitation between the forty energetically lowest levels of Fe¹³⁺. The scattering calculation is more complete than any previous work on this ion and significant differences are found in the excitation rates for many of the extreme ultra-violet (EUV) transitions, compared to earlier work. A detailed comparison is made between predicted line intensity ratios and those observed in solar coronal spectra which shows that several outstanding discrepancies are resolved by the new atomic data.