Issue |
Astron. Astrophys. Suppl. Ser.
Volume 131, Number 1, July 1998
|
|
---|---|---|
Page(s) | 153 - 166 | |
DOI | https://doi.org/10.1051/aas:1998426 | |
Published online | 15 July 1998 |
Atomic data from the IRON project*
XXXI. Electron impact excitation of optically allowed and intercombination electric dipole transitions in Fe xii
1
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, UK
2
Department of Physics and Astronomy, University College London, Gower Street, London WC1 E6BT, UK
Send offprint request to: A. Binello
Received:
9
January
1998
Accepted:
24
February
1998
A new, accurate set of electron impact
collisional data is presented, relating to all electric dipole
fine-structure transitions between the ground 3s2 3p3 and the first two
excited 3s 3p4, 3s2 3p2 3d configurations in Fe xii
(Fe11+). Theoretical energies have been obtained with a
multi-configuration atomic structure calculation. The
R-matrix method, coupled with the Coulomb-Bethe (CBe) approximation for the
high partial wave contributions to the collision strengths, has been
employed in the Fe11+ - scattering problem. The data
presented in this paper form part of the IRON Project effort to
provide the most accurate atomic data available to date for all the
iron ions (Hummer et al. 1993).
Key words: ion / atomic data / atomic processes / Sun: UV radiation
© European Southern Observatory (ESO), 1998