Atomic data from the IRON Project

XXV. Electron impact excitation of fine-structure transitions in the ground configuration of Fe xii

¹ Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, UK
² Department of Physics and Astronomy, University College London, Gower Street, London WC1 E6BT, UK

Send offprint request to: A. Binello

Received: 21 February 1997
Accepted: 21 February 1997

Abstract

In the framework of the IRON Project we have performed new, fully quantum mechanical atomic calculations for the Fe xii () coronal ion. Energy levels, oscillator strengths and spontaneous decay transition probabilities have been computed by including extensive configuration interaction (CI) and relativistic effects in the solution of the atomic structure problem. The R-matrix approach has been employed to solve the electron scattering problem and generate a new set of collisional atomic data. Results are discussed for the ten fine-structure forbidden transitions in the ground configuration of Fe  xii, and compared with previous calculations.