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Astron. Astrophys. 333, 385-388 (1998)

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Photoionisation cross sections for Fe XVII

P.J. Leo , K.L. Bell and F.P. Keenan

School of Mathematics and Physics, The Queen's University of Belfast, Belfast, BT7 1NN, Northern Ireland

Received 19 November 1997 / Accepted 9 January 1998


This paper reports the first close-coupling photoionisation calculation of Fe XVII, and provides accurate total and partial cross sections for photon energies up to 450 Ryd. The total and first partial photoionisation cross sections, the latter obtained when the Fe XVIII ion is left in the [FORMULA] ground state, are dominated by resonance structure for photon energies in the range from threshold to excitation of the first excited state ([FORMULA]) of Fe XVIII. This is the first time that such structure has been determined. The background cross section is found to be in good agreement (to within 10%) with the results of Verner and co-workers for the total cross section, and for the partial cross sections corresponding to [FORMULA] and [FORMULA] photoejection, respectively.

Key words: atomic data – atomic processes

Send offprint requests to: K.L. Bell (kl.bell@qub.ac.uk)

© European Southern Observatory (ESO) 1998

Online publication: April 15, 1998