Comparisons of laboratory wavelength measurements with theoretical calculations for neon-like through lithium-like argon, sulfur, and silicon

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Atomic structure codes have a difficult time accurately calculating the wavelengths of many-electron ions without the benefit of laboratory measurements. This is especially true for wavelengths of lines in the extreme ultraviolet and soft x-ray regions. We are using the low-energy capability of the Livermore electron beam ion traps to compile a comprehensive catalog of astrophysically relevant emission lines in support of satellite x-ray observations. Our database includes wavelength measurements, relative intensities, and line assignments, and is compared to a full set of calculations using the Hebrew University - Lawrence Livermore Atomic Code (HULLAC). Mean deviation of HULLAC calculations from ... continued below

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Lepson, J K; Beiersdorfer, P; Behar, E & Kahn, S M August 27, 2004.

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Atomic structure codes have a difficult time accurately calculating the wavelengths of many-electron ions without the benefit of laboratory measurements. This is especially true for wavelengths of lines in the extreme ultraviolet and soft x-ray regions. We are using the low-energy capability of the Livermore electron beam ion traps to compile a comprehensive catalog of astrophysically relevant emission lines in support of satellite x-ray observations. Our database includes wavelength measurements, relative intensities, and line assignments, and is compared to a full set of calculations using the Hebrew University - Lawrence Livermore Atomic Code (HULLAC). Mean deviation of HULLAC calculations from our measured wavelength values is highest for L-shell transitions of neon-like ions and lowest for lithium-like ions, ranging from a mean deviation of over 0.5 {angstrom} for Si V to 12 m{angstrom} in Ar XVI.

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PDF-file: 12 pages; size: 0.1 Mbytes

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  • Journal Name: Nuclear Instruments and Methods In Physics Research B; Journal Volume: 235

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  • Report No.: UCRL-JRNL-206300
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 875357
  • Archival Resource Key: ark:/67531/metadc873414

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  • August 27, 2004

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 22, 2016, 11:08 p.m.

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Lepson, J K; Beiersdorfer, P; Behar, E & Kahn, S M. Comparisons of laboratory wavelength measurements with theoretical calculations for neon-like through lithium-like argon, sulfur, and silicon, article, August 27, 2004; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc873414/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.