Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.298..147v&link_type=abstract
Astrophysics and Space Science, Volume 298, Issue 1-2, pp. 147-153
Astronomy and Astrophysics
Astrophysics
3
Photoionization, X-Ray, Spectroscopy
Scientific paper
In experiments at the high-power Z-facility at Sandia National Laboratory in Albuquerque, New Mexico, we have been able to produce a low density photoionized laboratory plasma of Fe mixed with NaF. The conditions in the experiment allow a meaningful comparison with X-ray emission from astrophysical sources. The charge state distributions of Fe, Na and F are determined in this plasma using high resolution X-ray spectroscopy. Independent measurements of the density and radiation flux indicate unprecedented values for the ionization parameter ξ = 20 25 erg cm s-1 under nearly steady-state conditions. First comparisons of the measured charge state distributions with X-ray photoionization models show reasonable agreement, although many questions remain.
Bailey James E.
Chung Hyun-Kung
Cuneo M. E.
Foord Mark E.
Goldstein William H.
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