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Astron. Astrophys. 337, L21-L24 (1998)

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Letter to the Editor

K-shell photoejection cross section for neutral iron

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

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

Received 29 April 1998 / Accepted 23 July 1998

Abstract

This Letter presents the first ab initio calculation, using the R-matrix method, of the cross section for photoejection of a K-shell electron from neutral iron. A 9-state target state approximation is employed, and the results are compared with recent theoretical values, namely the Hartree-Dirac-Slater method data of Verner and co-workers (1993, 1995). At the highest photon energy considered (640 Ryd), agreement is excellent. However, with decreasing photon energy the two calculations diverge, and the behaviour of the present cross section near threshold shows a rapid rise from threshold in contrast to earlier work for which the behaviour of the cross section as a function of photon energy is approximately linear.

Key words: atomic data – atomic processes

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

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© European Southern Observatory (ESO) 1998

Online publication: August 17, 1998
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