Measurement of absolute excitation cross-sections for n=3, 4, 5, 6 to n=2 transitions from Fe XXIII and Fe XXIV

Details Measurement of absolute excitation cross-sections for n=3, 4, 5, 6 to n=2 transitions from Fe XXIII and Fe XXIV Measurement of absolute excitation cross-sections for n=3, 4, 5, 6 to n=2 transitions from Fe XXIII and Fe XXIV

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.1310c&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #13.10; Bulletin of the American Astronomical Society, Vol. 32, p.1199

Astronomy and Astrophysics

Astrophysics

Scientific paper

Observations of the Centaurus cluster by ASCA raised questions about the magnitude of the n=4 to n=2 emissions in Fe XXIII and Fe XXIV, putting the accuracy of the collisional excitation cross-sections used in the spectral modeling packages in doubt. This issue also affects the interpretations of spectra obtained by Chandra and XMM. In most cases the cross-sections used in the spectra fitting packages come from calculations. Recently, with the implementation of the engineering model XRS detector from the Astro-E mission at the Livermore EBIT-2 source, it is now possible for us to provide cross-sections scaled to the absolute intensity of radiative recombination measured by the XRS. We present results from the measurement for Fe XXIII and Fe XXIV line emission for 3 -- 2, 4 -- 2, 5 -- 2 and 6 -- 2 transitions at wavelength band from 7 Å to11 Å using both flat-crystal spectrometers and the XRS. This work was performed under the auspices of the U.S. Department of Energy by University of California Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48 and supported by NASA Space Astrophysics Research and Analysis grants to LLNL, GSFC, and Columbia University.

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