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A&A Supplement series, Vol. 127, February I 1998, 545-553

Received February 21; accepted February 21, 1997

Atomic data from the IRON Project

XXV. Electron impact excitation of fine-structure transitions in the ground configuration of FeXII

A.M. Binellotex2html_wrap1712 - H.E. Masontex2html_wrap1712 - P.J. Storeytex2html_wrap1716

Send offprint request: A. Binello

tex2html_wrap1718  Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, UK
tex2html_wrap1720  Department of Physics and Astronomy, University College London, Gower Street, London WC1 E6BT, UK


In the framework of the IRON Project we have performed new, fully quantum mechanical atomic calculations for the FeXII (tex2html_wrap_inline1694) coronal ion. Energy levels, oscillator strengths and spontaneous decay transition probabilities have been computed by including extensive configuration interaction (CI) and relativistic effects in the solution of the atomic structure problem. The R-matrix approach has been employed to solve the electron scattering problem and generate a new set of collisional atomic data. Results are discussed for the ten fine-structure forbidden transitions in the tex2html_wrap_inline1698 ground configuration of FeXII, and compared with previous calculations.

keywords: atomic data -- atomic processes -- Sun: corona -- Sun: UV radiation

Copyright by the European Southern Observatory (ESO)