Comparisons of laboratory wavelength measurements with theoretical calculations for neon-like through lithium-like argon, sulfur and silicon
✍ Scribed by J.K. Lepson; P. Beiersdorfer; E. Behar; S.M. Kahn
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 97 KB
- Volume
- 235
- Category
- Article
- ISSN
- 0168-583X
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✦ Synopsis
Atomic structure codes have a difficult time accurately calculating the wavelengths of many-electron ions without the benefit of laboratory measurements. This is especially true for wavelengths of lines in the extreme ultraviolet and soft Xray regions. We are using the low-energy capability of the Livermore electron beam ion traps to compile a comprehensive catalog of astrophysically relevant emission lines in support of satellite X-ray observations. Our database includes wavelength measurements, relative intensities and line assignments, and is compared to a full set of calculations using the Hebrew University -Lawrence Livermore Atomic Code (HULLAC). Mean deviation of HULLAC calculations from our measured wavelength values is is highest for L-shell transitions of neon-like ions and lowest for lithium-like ions, ranging from a mean deviation of over 500 m A ˚for Si V to 12 mA ˚in Ar XVI.