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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. Binello
- H.E. Mason
- P.J. Storey
Send offprint request: A. Binello
Department of Applied Mathematics and Theoretical
Physics, University of Cambridge,
Silver Street, Cambridge CB3 9EW, UK
Department of Physics and Astronomy, University College London,
Gower Street, London WC1 E6BT, UK
Abstract:
In the framework of the IRON Project we have performed new, fully
quantum mechanical atomic calculations for the FeXII
(
) 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 
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)