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Astron. Astrophys. 322, 359-363 (1997)

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Photoionisation cross-sections for Fe XXIII and Fe XXIV

G.M. Black , K.L. Bell and F.P. Keenan

School of Maths and Physics,The Queen's University of Belfast, Belfast, BT7 1NN, Northern Ireland (kl.bell@qub.ac.uk; fpk@qub.ac.uk)

Received 4 November 1996 / Accepted 16 November 1996


Photoionisation of Fe XXIII and Fe XXIV is investigated using the R-matrix method, with particular attention being given to photoejection of the [FORMULA] K-shell electron. In both cases, good agreement (to within 5 [FORMULA]) is found with earlier calculations of the background cross-section. However, the present work is the first to determine resonance structure just below and above the [FORMULA] photoejection threshold energy.

Key words: atomic data – atomic processes

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998