Astronomy & Astrophysics

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Issue		A&A Volume 365, Number 2, January II 2001
Page(s)		258 - 265
Section		Atomic and molecular data
DOI		10.1051/0004-6361:20000330

A&A 365, 258-265 (2001)
DOI: 10.1051/0004-6361:20000330

Atomic data from the IRON project

XLVI. Electron excitation of $\mathsf{3s3p^6 and 3s^{2}3p^$ fine-structure transitions in Fe x

J. C. Pelan¹ and K. A. Berrington² .

¹ Gatsby Computational Neuroscience Unit, University College, 17 Queen Square, London WC1N 3AR, UK
² School of Science & Mathematics, Sheffield Hallam University, Sheffield S1 1WB, UK

(Received 21 July 2000 / Accepted 2 October 2000 )

Abstract
Electron excitation collision strengths for fine-structure transitions 3s²3p⁵-3s3p⁶, 3s²3p⁵-3s²3p⁴3d and 3s3p⁶-3s²3p⁴3d in Fe X, are calculated using a 180-level Breit-Pauli R-matrix calculation containing the above levels together with those from 3s3p⁵3d and 3s²3p³3d² configurations. The collision strength is averaged over a Maxwellian velocity distribution to obtain the effective fine-structure collision strengths as a function of electron temperature from $\log T({\rm K})=5.4-7.0$ . We show that low-energy resonances enhance the effective collision strength, with significant effects on level populations.

Key words: atomic data

Offprint request: K. A. Berrington

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Atomic data from the IRON project

XLVI. Electron excitation of fine-structure transitions in Fe x

XLVI. Electron excitation of $\mathsf{3s3p^6 and 3s^{2}3p^$ fine-structure transitions in Fe x