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A&A Supplement Series, Vol. 126, November II 1997, 105-111

Received January 20; accepted March 3, 1997

Atomic data from the IRON Project

XXIV. Electron excitation of Li-like Fe XXIV between the n = 2 and n' = 2, 3, 4 fine-structure levels

K.A. Berringtontex2html_wrap1952 and J.A. Tullytex2html_wrap1954

tex2html_wrap538  Department of Applied Mathematics & Theoretical Physics, The Queen's University of Belfast, Belfast BT7 1NN, UK
tex2html_wrap538  Département G.D. Cassini, Observatoire de la Côte d'Azur, BP. 4229, 06304 Nice Cedex 4, France


Collision strengths for electron induced transitions in Li-like Fe XXIV are calculated using a Breit-Pauli R-matrix technique. The target has 15 fine structure states corresponding to tex2html_wrap_inline1924. Autoionizing resonances are found to affect 18 of the 39 collision strengths, namely those for transitions tex2html_wrap_inline1926 where n' = 2, 3. The present calculation is carried out only for electrons incident on the ground state with energies not exceeding 265 Ry. Beyond this we use the relativistic distorted wave collision strengths of Zhang et al. in order to complete our results. Thermally averaged collision strengths are computed and tabulated as functions of tex2html_wrap_inline1930 for transitions out of the tex2html_wrap_inline1932, tex2html_wrap_inline1934 and tex2html_wrap_inline1936 states. The temperature range considered is tex2html_wrap_inline1938, Fe XXIV having its maximum coronal abundance when tex2html_wrap_inline1940.

keywords: Li-like iron -- electron collision -- atomic data

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