Excitation rates for transitions in Ca XV^*

Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland, UK

Corresponding author: K. M. Aggarwal, K.Aggarwal@qub.ac.uk

Received: 17 March 2003
Accepted: 22 May 2003

Abstract

Collision strengths for transitions among the energetically lowest 46 fine-structure levels belonging to the (1s²) 2s²2p², 2s2p³, 2p⁴, and 2s²2p3 configurations of Ca XV are computed, over a wide electron energy range below 300 Ryd, using the Dirac Atomic R-matrix Code (DARC) of Norrington & Grant ([CITE]). Resonances in the threshold region have been resolved in a fine energy mesh, and excitation rates are determined over a wide electron temperature range below 10⁷ K. The results are compared with those available in the literature, and the accuracy of the data is assessed.