Issue |
A&A
Volume 446, Number 3, February II 2006
|
|
---|---|---|
Page(s) | 1185 - 1190 | |
Section | Atomic, molecular, and nuclear data | |
DOI | https://doi.org/10.1051/0004-6361:20053813 | |
Published online | 20 January 2006 |
Electron collisions with Fe-peak elements: Fe IV
I. Forbidden transitions: 3d
– 3d
4s and 3d
– 3d
4p manifolds
1
School of Mathematics and Physics, Queen's University of Belfast, Belfast BT7 1NN, UK e-mail: b.mclaughlin@qub.ac.uk
2
Computational Science and Engineering Department, CCLRC Daresbury Laboratory, Keckwick Lane, Daresbury, Warrington WA4 4AD, UK
Received:
11
July
2005
Accepted:
26
September
2005
Electron-impact excitation collision strengths of
the Fe-peak element Fe IV are calculated in the close-coupling
approximation using the parallel R-matrix program PRMAT.
One hundred and eight LS – coupled states arising from the ,
and
configurations of Fe IV,
are retained in the present calculations. Accurate multi-configuration
target wavefunctions are employed with the aid of
electron promotions and a
correlation orbital.
The effective collision strengths required
in the analysis of astrophysically important
lines in the Fe IV spectra, are obtained by averaging the electron collision
strengths for a wide range of incident electron energies,
over a Maxwellian distribution of velocities.
Results are tabulated for forbidden transitions between the
,
and the
manifolds
for electron temperatures (Te in degrees Kelvin) in the range
that are applicable to many
laboratory and astrophysical plasmas.
The present results provide new results for
forbidden lines in the Fe IV spectrum studied here.
Key words: atomic data / atomic processes
© ESO, 2006
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