Recombination and Ionization Measurements at the Heidelberg Heavy Ion Storage Ring TSR

Details Recombination and Ionization Measurements at the Heidelberg Heavy Ion Storage Ring TSR Recombination and Ionization Measurements at the Heidelberg Heavy Ion Storage Ring TSR

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1503h&link_type=abstract

American Astronomical Society, HEAD meeting #11, #15.03; Bulletin of the American Astronomical Society, Vol. 41, p.678

Physics

Nuclear Physics

Scientific paper

Reliable ionization balance calculations are needed to analyze spectra from a wide range of cosmic sources including photoionized objects such as AGNs and X-ray binaries and electron ionized objects such as as stars, supernovae, galaxies, and clusters of galaxies. These theoretical charge state distributions (CSD) depend in turn upon the underlying atomic data. Of particular importance are reliable rate coefficients for dielectronic recombination (DR), which is the dominant electron-ion recombination recombination mechanism for most ions, and for electron impact ionzation (EII). We are carrying out DR and EII measurements of astrophysically important ions using the heavy ion Test Storage Ring (TSR) at the Max-Plank-Insitute for Nuclear Physics in Heidelberg, Germany. The storage ring measurements are largely free of the metastable contamination found in other experimental geometries. Storage ring measurements therefore result in more precise DR and EII reaction rate measurements. The measured rate coefficients can be used in plasma modelling as well as in the benchmarking of theoretical atomic calculations. Here we report recent DR and EII measurements of Mg VIII and Fe XII.

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