Issue |
Astron. Astrophys. Suppl. Ser.
Volume 127, Number 3, February I 1998
|
|
---|---|---|
Page(s) | 545 - 553 | |
DOI | https://doi.org/10.1051/aas:1998373 | |
Published online | 15 February 1998 |
Atomic data from the IRON Project
XXV. Electron impact excitation of fine-structure transitions in the ground configuration of 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:
21
February
1997
Accepted:
21
February
1997
In the framework of the IRON Project we have performed new, fully
quantum mechanical atomic calculations for the Fe xii
() 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 Fe
xii, and compared with previous calculations.
Key words: atomic data / atomic processes / Sun: corona / Sun: UV radiation
© European Southern Observatory (ESO), 1998