Laboratory astrophysics: Measurements of n=n' to n=2 line emission in Fe16+ to Fe23+

Details Laboratory astrophysics: Measurements of n=n' to n=2 line emission in Fe16+ to Fe23+ Laboratory astrophysics: Measurements of n=n' to n=2 line emission in Fe16+ to Fe23+

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..381...39s&link_type=abstract

The tenth American Physical Society topical conference on atomic processes in plasmas. AIP Conference Proceedings, Volume 381,

Astronomy and Astrophysics

Astrophysics

2

Atomic Processes And Interactions, Visible And Ultraviolet Spectra

Scientific paper

One of the dominant forms of astronomical line emission in the 6 A˚ to 18 A˚ spectral region is line emission produced by n=n' to n=2 transitions in Fe16+ to Fe23+ (i.e., Fe L-shell n-2 line emission). Using the Lawrence Livermore National Laboratory electron beam ion trap (EBIT) facility, we 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. We 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. We 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 Fe23+. Preliminary results agree with distorted wave calculations to within 20 percent and better.

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