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Multi-channel Measurements of X-ray emission following Dielectronic Recombination

Presentation #105.24 in the session Missions and Instruments - Poster Session.

Published onMay 03, 2024
Multi-channel Measurements of X-ray emission following Dielectronic Recombination

EBIT-I at Lawrence Livermore National Laboratory continues to be used to study the x-ray emission from highly charged ions in an effort to help decode complex spectra from celestial x-ray sources. The measurements include transition energies, electron impact excitation cross sections, studies of resonant recombination processes, and charge exchange recombination. As part of this laboratory astrophysics program, we are measuring dielectronic recombination (DR) resonance strengths and branching ratios. Dielectronic recombination has a strong effect on charge balance, on line shapes, and is highly temperature sensitive. The uncertainty associated with DR, however, has been shown to be relatively large. While most measurements to date have focused on the primary decay channel, usually the K-shell decay in resonances of the type KLn, where n is the L-shell, M-shell, or higher, our studies include measurement of the emission following the decay of the remaining satellite electron. This work extends work completed earlier at LLNL. Selected results will be presented. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 and supported by NASA grants to LLNL, NASA/GSFC, and Harvard-Smithsonian Center for Astrophysics.

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