Issue |
A&A
Volume 403, Number 3, June I 2003
|
|
---|---|---|
Page(s) | 1175 - 1184 | |
Section | Atomic, molecular, and nuclear data | |
DOI | https://doi.org/10.1051/0004-6361:20030405 | |
Published online | 23 May 2003 |
A complete set of radiative and Auger rates for K-vacancy states in Fe XVIII–Fe XXV*
1
NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA
2
Centro de Física, Instituto Venezolano de Investigaciones Científicas (IVIC), PO Box 21827, Caracas 1020A, Venezuela
Corresponding author: T. R. Kallman, timothy.r.kallman@nasa.gov
Received:
26
November
2002
Accepted:
17
March
2003
A complete set of level energies, wavelengths, A-values, and
total and partial Auger
rates have been computed for transitions involving the K-vacancy
states within the complex of Fe xviii–Fe xxv.
Three different standard numerical packages are used for this purpose,
namely autostructure, the Breit–Pauli R-matrix suite
(bprm) and hfr, which allow reliable
estimates of the physical effects involved and of the accuracy of
the resulting data sets. The Breit interaction is taken into account
because its contributions to the small A-values and partial Auger rates
cannot be neglected with increasing electron occupancy.
Semiempirical adjustments can also lead to
large differences in both the radiative and Auger decay data of
strongly mixed levels. Several experimental level energies and
wavelengths are questioned, and significant discrepancies are
found with previously computed decay rates that are attributed to
numerical problems. The statistical accuracy of the present level
energies and wavelengths is ranked at ±3 eV and ±2 mÅ, respectively,
and that for A-values and partial
Auger rates greater than 1013 s-1 at better than 20%.
Key words: atomic data / atomic processes / X-rays: general
© ESO, 2003
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