Spectroscopy of Trapped Ions with a Microcalorimeter on the NIST Electron Beam Ion Trap

Details Spectroscopy of Trapped Ions with a Microcalorimeter on the NIST Electron Beam Ion Trap Spectroscopy of Trapped Ions with a Microcalorimeter on the NIST Electron Beam Ion Trap

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002nla..work...96t&link_type=abstract

NASA Laboratory Astrophysics Workshop, held May 1-3 2002 at NASA Ames Research Center, Moffett Field, CA 94035-1000. Publisher:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We report on progress in X-ray spectroscopy of trapped ions on the NIST EBIT. Our initial experiments have concentrated on the astrophysically important spectrum of Fe XVII (Laming et al., 2000). We demonstrated that the atomic physics theory for the intensity ratio between two groups of strong lines at ~ 15 Å and ~ 17 Å was essentially correct, and inconsistent with solar and stellar observations. More recently it has been shown that the inclusion in theoretical models of dielectronic recombination from Fe XVIII (Doron & Behar 2002; this is a process not present in the EBIT experiments) can account for this discrepancy. Further experiments with a dedicated multi-channel microcalorimeter with relatively high throughput will allow investigation of weaker spectral features within a reasonable data acquisition time. Absolute measurements will be made of line intensities relevant to X-ray observations of solar/stellar coronae, supernova remnants, comets, and also to in situ particle measurements in the solar wind. We acknowledge support from NASA programs Space Astrophysics Research and Analysis, Applied Information Systems Research, from the NRL/ONR Solar Magnetism and the Earth's Environment 6.1 Research Option, and from the Swedish Foundation for Cooperation in Research and Higher Education.

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