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A&A 432, 1151-1155 (2005)
DOI: 10.1051/0004-6361:20042351
Electron impact excitation of Al XIII: A relativistic approach
K. M. Aggarwal1, F. P. Keenan1 and S. J. Rose21 Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland, UK
e-mail: K.Aggarwal@qub.ac.uk
2 Department of Physics, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, UK
(Received 10 November 2004 / Accepted 29 November 2004 )
Abstract
Energy levels, radiative rates, collision strengths, and effective collision strengths for all transitions up to and including the n = 5 levels of Al XIII have been computed
in the jj coupling scheme including relativistic effects. All partial waves with angular momentum 
have been included, and resonances have been
resolved in a fine energy grid in the threshold region. Collision strengths are tabulated at energies above thresholds in the range
Ryd, and results
for effective collision strengths, obtained after integrating the collision strengths over a Maxwellian distribution of electron velocities, are tabulated
over a wide temperature range of
K. The importance of including relativistic effects in a calculation is discussed in comparison
with the earlier available non-relativistic results.
Key words: atomic data -- atomic processes
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