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

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.0301l&link_type=abstract

American Astronomical Society, AAS Meeting #212, #3.01; Bulletin of the American Astronomical Society, Vol. 40, p.183

Physics

Nuclear Physics

Scientific paper

Much of our knowledge of the universe rests on our ability to interpret spectra collected from various cosmic sources. This analysis requires reliably understanding the underlying charge state distribution (CSD) for the observed gas. In turn, this depends on accurate rate coefficients for dielectronic recombination (DR) and electron impact ionization (EII), which play important roles in determining the CSD for a wide range of cosmic objects. To address these needs we have an ongoing experimental program carrying out DR and EII measurements for astrophysically important ions of cosmically abundant elements. Measurements are performed using the heavy-ion Test Storage Ring (TSR) at the Max-Plank-Institute for Nuclear Physics in Heidelberg, Germany. Storage rings are currently the only laboratory method capable of studying the astrophysically relevant DR channels for the majority of cosmically important ions. They are also the only method capable of studying EII using beams of ions with multiple electrons in the valence shell which are free of metastable contamination, allowing for unambiguous EII laboratory data. We use our results to produce rate coefficients for plasma modelling. We are also providing our data to atomic theorist to benchmark their calculations. Here we report our recent results for DR measurements of Fe XI and Fe X and show an early status report on the analysis of recent EII measurements of C IV, C V and O IV.
This work has been supported in part by NASA, the German Federal Ministry for Education and Research, and the German Research Council.

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