Modeling of high-resolution K{alpha} emission spectra from Fe XVIII through Fe XXIV

Journal Article · Tue Jul 01 00:00:00 EDT 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.68.012509· OSTI ID:20639899

Decaux, V ^[1]; Jacobs, V L ^[2]; Beiersdorfer, P; Liedahl, D A ^[1]; Kahn, S M ^[3]

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1. Department of Physics and Advanced Technologies, Lawrence Livermore National Laboratory, Livermore, California 94550, USA (United States)
2. Center for Computational Materials Science, Materials Science and Technology Division, Naval Research Laboratory, Washington, DC 20375-5000, USA (United States)
3. Columbia Astrophysics Laboratory, Columbia University, New York, New York 10027, USA (United States)

Results for K{alpha} x-ray emission from highly charged iron ions, which were obtained from a detailed and systematic spectral model, are presented in the wavelength range from 1.84 to 1.94 Aa. Account has been taken of the fundamental atomic radiative-emission processes associated with inner-shell electron collisional excitation, inner-shell electron collisional ionization, as well as dielectronic recombination. Particular emphasis has been directed at the identification of spectral features that can serve as diagnostics of extreme nonequilibrium or transient-ionization conditions, which can occur in stellar flares and supernova remnants, as well as in tokamak plasmas. In order to investigate the fundamental K{alpha} line-formation processes that can play a dominant role under these conditions, theoretical predictions have been compared with spectral observations of the EBIT-II x-ray emission from highly charged Fe ions in the electron-beam ion trap at the Lawrence Livermore National Laboratory. The observed spectroscopic features are found to be well represented by our theoretical calculations, validating earlier theoretical work on transient-ionization phenomena. We have identified spectral features that can serve as diagnostics of the electron density, the line-formation mechanism, and the charge-state distribution.

• OSTI ID: 20639899
• Journal Information: Physical Review. A, Vol. 68, Issue 1; Other Information: DOI: 10.1103/PhysRevA.68.012509; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CATIONS
CHARGE STATES
ELECTRON BEAMS
ELECTRON DENSITY
ELECTRONS
EMISSION SPECTRA
EXCITATION
INNER-SHELL IONIZATION
IRON IONS
LAWRENCE LIVERMORE NATIONAL LABORATORY
MULTICHARGED IONS
PHOTON EMISSION
PLASMA DIAGNOSTICS
RECOMBINATION
SIMULATION
STELLAR FLARES
STELLAR RADIATION
SUPERNOVA REMNANTS
TOKAMAK DEVICES
TRANSIENTS
TRAPS
X RADIATION
X-RAY SPECTRA