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DOI 10.2172/238552
Title Laboratory astrophysics: Measurements of n = n{prime} to n = 2 line emission in Fe{sup 16+} to Fe{sup 23+}
Creator/Author Savin, D.W. [Univ. of California, Berkeley, CA (United States). Space Sciences Lab.] ; Beiersdorfer, P. ; Lopez-Urrutia, J.C. ; Decaux, V. ; Liedahl, D.A. ; Reed, K.J. ; Widmann, K. [Lawrence Livermore National Lab., CA (United States). Dept. of Physics and Space Technology] ; Brown, G.V. [Auburn Univ., AL (United States). Dept. of Physics] ; Kahn, S.M. [Columbia Univ., New York, NY (United States). Dept. of Physics]
Publication Date1996 Mar 05
OSTI IdentifierOSTI ID: 238552; Legacy ID: DE96010823
Report Number(s)UCRL-JC--123517; CONF-960155--4
DOE Contract NumberW-7405-ENG-48
DOI10.2172/238552
Other Number(s)Other: ON: DE96010823; CNN: Grant NASA NAGW-4185; TRN: TRN: AHC29612%%102
Resource TypeTechnical Report
Resource RelationConference: 10. American Physical Society (APS) topical conference on atomic processes and plasmas, San Francisco, CA (United States), 14-18 Jan 1996; Other Information: PBD: 5 Mar 1996
Research OrgLawrence Livermore National Lab., CA (United States)
Sponsoring OrgUSDOE, Washington, DC (United States);National Aeronautics and Space Administration, Washington, DC (United States)
Subject66 PHYSICS; IRON IONS; EMISSION SPECTRA; SOLAR CORONA; X-RAY SPECTRA; GALAXY CLUSTERS; ASTROPHYSICS; X-RAY SPECTROSCOPY; ENERGY-LEVEL TRANSITIONS; MULTICHARGED IONS; STARS; GALAXY NUCLEI; EXPERIMENTAL DATA
Description/AbstractOne of the dominant forms of astronomical line emission in the 6 {angstrom} to 18 {angstrom} spectral region is line emission produced by n = n{prime} to n = 2 transitions in Fe{sup 16+} to Fe{sup 23+} (i.e., Fe L-shell n-2 line emission). Using the Lawrence Livermore National Laboratory electron beam ion trap (EBIT) facility, the authors have carried out a number of measurements designed to address astrophysical issues concerning Fe L-shell line emission. Desired ions are produced and trapped using the nearly monoenergetic electron beam of EBIT. Trapped ions are collisionally excited and the resulting X-ray line emission detected using Bragg crystal spectrometers. They have recently completed a line survey of Fe L-shell 3-2 line emission. The line survey will allow a more reliable accounting of line blending in astronomical spectra. They have now begun a series of broadband, high resolution line ratio measurements. These measurements are designed to benchmark atomic calculations used in astronomical plasma emission codes and also for comparison with X-ray spectral observations of astronomical objects. Initial measurements have been carried out in Fe{sup 23+}. Preliminary results agree with distorted wave calculations to within 20% and better.
Country of PublicationUnited States
LanguageEnglish
FormatMedium: P; Size: 10 p.
Availability OSTI as DE96010823
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System Entry Date2008 Feb 04
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