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Experimental and theoretical evaluation of density sensitive N VII, Ar XIV and Fe XXII line ratios [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2004.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
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PDF-file: 25 pages; size: 0.3 Mbytes
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The line ratios of the 2p-3d transitions in the B-like spectra Ar XIV and Fe XXII have been measured using the electron beam ion traps at Livermore. Radiative-collisional model calculations show these line ratios to be sensitive to the electron density in the ranges ne = 10¹° to 10¹² cm⁻³ and ne = 10¹³ to 10¹⁵ cm⁻³, respectively. In our experiment, the electron beam density of about 10¹¹ cm⁻³ was varied by about a factor of 5. Our data show a density effect for the line doublet in Ar XIV, and good agreement with theory is found. The relative intensity of the Fe XXII doublet shows good agreement with our predicted low density limit. The N VI K-shell spectrum was used to infer the actual electron density in the overlap region of ion cloud and electron beam, and systematic measurements and calculations of this spectrum are presented as well. The Ar XIV and Fe XXII spectra promise to be reliable density diagnostics for stellar coronae, complementing the K-shell diagnostics of helium-like ions.
Report Numbers
E 1.99:ucrl-jrnl-201794
ucrl-jrnl-201794
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Published through SciTech Connect.
01/09/2004.
"ucrl-jrnl-201794"
Published in: Astrophysical Journal, vol. 611, no. 1, August 10, 2004, pp. 598-604 611 1 ISSN 0004-637X; ASJOAB FT
Chen, H; Gu, M F; Beiersdorfer, P; Trabert, E; Liedahl, D A; Lepson, J K; Heeter, L A; Naranjo-Rivera, K L.
Funding Information
W-7405-ENG-48
View MARC record | catkey: 14739111