Laboratory Measurements of 3 --> 2 X-ray Line Ratios of F-like Fe XVIII and Ni XX

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The intensity ratios of 3 {yields} 2 emission lines of Fe XVIII and Ni XX were measured on the Livermore electron beam ion trap (EBIT-I) with a flat-field grating spectrometer. The results were compared with distorted-wave (DW) calculations obtained with the Flexible Atomic Code and recent close-coupling calculations using the R-matrix code. The measured 3s {yields} 2p/3d {yields} 2p ratios are about 20-40% higher than the theoretical values. When more extended configuration interaction is included in the DW theory, the agreement with the measurements improved slightly. At the beam energies of these measurements, no significant resonance contribution is expected to ... continued below

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Gu, M F; Chen, H; Brown, G V; Beiersdorfer, P & Kahn, S M March 8, 2007.

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The intensity ratios of 3 {yields} 2 emission lines of Fe XVIII and Ni XX were measured on the Livermore electron beam ion trap (EBIT-I) with a flat-field grating spectrometer. The results were compared with distorted-wave (DW) calculations obtained with the Flexible Atomic Code and recent close-coupling calculations using the R-matrix code. The measured 3s {yields} 2p/3d {yields} 2p ratios are about 20-40% higher than the theoretical values. When more extended configuration interaction is included in the DW theory, the agreement with the measurements improved slightly. At the beam energies of these measurements, no significant resonance contribution is expected to be present, and the discrepancies represent the uncertainties in the direct excitation cross sections.

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PDF-file: 14 pages; size: 0.1 Mbytes

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  • Journal Name: Astrophysical Journal, vol. 670, N/A, December 1, 2007, pp. 1504; Journal Volume: 670

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  • Report No.: UCRL-JRNL-228888
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 940496
  • Archival Resource Key: ark:/67531/metadc894045

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  • March 8, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 8, 2016, 8:24 p.m.

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Gu, M F; Chen, H; Brown, G V; Beiersdorfer, P & Kahn, S M. Laboratory Measurements of 3 --> 2 X-ray Line Ratios of F-like Fe XVIII and Ni XX, article, March 8, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc894045/: accessed December 9, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.