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Issue A&A
Volume 410, Number 1, October IV 2003
Page(s) 359 - 364
Section Celestial mechanics and astrometry
DOI http://dx.doi.org/10.1051/0004-6361:20031262



A&A 410, 359-364 (2003)
DOI: 10.1051/0004-6361:20031262

Modeling of iron K lines: Radiative and Auger decay data for $\ion{Fe}{ii}$- $\ion{Fe}{ix}$

P. Palmeri1, C. Mendoza1, T. R. Kallman1, M. A. Bautista2 and M. Meléndez2

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

(Received 19 June 2003 / Accepted 8 August 2003 )

Abstract
A detailed analysis of the radiative and Auger de-excitation channels of K-shell vacancy states in Fe II-Fe IX has been carried out. Level energies, wavelengths, A-values, Auger rates and fluorescence yields have been calculated for the lowest fine-structure levels populated by photoionization of the ground state of the parent ion. Different branching ratios, namely K $\alpha_2$/K $\alpha_1$, K $\beta$/K $\alpha$, KLM/KLL, KMM/KLL, and the total K-shell fluorescence yields, $\omega_{\rm K}$, obtained in the present work have been compared with other theoretical data and solid-state measurements, finding good general agreement with the latter. The K $\alpha_2$/K $\alpha_1$ ratio is found to be sensitive to the excitation mechanism. From these comparisons it has been possible to estimate an accuracy of ~10% for the present transition probabilities.


Key words: atomic data -- atomic processes -- techniques: spectroscopic

Offprint request: T. R. Kallman, timothy.r.kallman@nasa.gov


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