Comparisons of laboratory wavelength measurements with theoretical calculations for neon-like through lithium-like argon, sulfur and silicon

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:235

Article; Proceedings Paper

Lepson, JK ; Beiersdorfer, P ; Behar, E ; Kahn, SM

关键词: emission spectra;    EUV lines;    electron beam ion trap;    HULLAC;   

DOI  :  10.1016/j.nimb.2005.03.159

来源: Elsevier

【 摘 要 】

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 m angstrom in Ar XVI. (c) 2005 Elsevier B.V. All rights reserved.

【 授权许可】

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