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Astron. Astrophys. 345, 663-668 (1999)


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Proton impact excitation of the 1s22s22p2 3P fine-structure transitions in carbon-like ions

R.S.I. Ryans 1, V.J. Foster-Woods 1, R.H.G. Reid 2 and F.P. Keenan 1

1 Department of Pure and Applied Physics, Queen's University, Belfast, BT7 1NN, Ireland (R.Ryans, F.Keenan@qub.ac.uk)
2 Department of Applied Mathematics and Theoretical Physics, Queen's University, Belfast, BT7 1NN, Ireland (R.Reid@qub.ac.uk)

Received 1 August 1998 / Accepted 22 March 1999

Abstract

We present new cross sections and thermally averaged excitation rate coefficients for proton impact excitation of the 1s22s22p2 3P fine-structure transitions for ions in the carbon isoelectronic sequence. These data have been calculated using a close-coupled impact parameter method that incorporates the effects of higher lying levels of the triplet 2s2p3 configuration. We find that the inclusion of these additional states leads to significant reductions in excitation rates for high-Z ions.

Key words: Sun: chromosphere – atomic data

Send offprint requests to: R.S.I. Ryans (R.Ryans@qub.ac.uk)

© European Southern Observatory (ESO) 1999

Online publication: April 19, 1999

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