Laboratory astrophysics: Measurements of n = n{prime} to n = 2 line emission in Fe{sup 16+} to Fe{sup 23+}
- Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
- Lawrence Livermore National Lab., CA (United States). Dept. of Physics and Space Technology
- Auburn Univ., AL (United States). Dept. of Physics
- Columbia Univ., New York, NY (United States). Dept. of Physics
One 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.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 238552
- Report Number(s):
- UCRL-JC-123517; CONF-960155-4; ON: DE96010823; CNN: Grant NASA NAGW-4185; TRN: AHC29612%%102
- Resource Relation:
- Conference: 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
- Country of Publication:
- United States
- Language:
- English
Similar Records
Laboratory Measurements and Modeling of the Fe xvii X-Ray Spectrum
Excitation Cross Section Measurement for n=3 to n=2 Line Emission in Fe{sup 20+} to Fe{sup 23+}