Laboratory Measurements Of Charge Exchange Spectra From Sulfur Ions

Details Laboratory Measurements Of Charge Exchange Spectra From Sulfur Ions Laboratory Measurements Of Charge Exchange Spectra From Sulfur Ions

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560411k&link_type=abstract

American Astronomical Society, AAS Meeting #215, #604.11; Bulletin of the American Astronomical Society, Vol. 36, p.1128

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X-ray emission from charge exchange (CX) collisions of solar wind heavy ions with interstellar neutrals (H, He) penetrating the solar system significantly contributes to the diffuse soft X-ray background in the 1/4 keV band (from 0.1 to 0.3 keV). Projectile solar wind ions include L-shell ions of sulfur, i.e. fluorine-like S7+ through carbon-like S10+. At present, there is no laboratory tested model available for interpreting the CX contribution to the 1/4 keV energy band. As a first step towards understanding these spectra we have used the Lawrence Livermore National Laboratory’s Electron beam ion trap (EBIT-I) and the NASA/GSFC EBIT Calorimeter Spectrometer (ECS) to measure high resolution X-ray spectra from sulfur ions produced by direct excitation (DE) and CX with SF6 molecules. The CX spectra show clear enhancement of transitions with high principal quantum numbers (n > 4) compared to the DE spectra where the n = 3 to n = 2 transitions are dominant. We discuss the results and the perspectives of extending this study to other highly charged ions (e.g. Fe, Mg, Si) and neutral targets (atomic H and He) as well as their impact on solar system SWCX studies. Part of this work was prepared by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.

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