Energy-dependent excitation cross section measurements of the diagnostic lines of Fe XVII

By implementing a large-area, gain-stabilized microcalorimeter array on an electron beam ion trap, the electron-impact excitation cross sections for the dominant x-ray lines in the Fe XVII spectrum have been measured as a function of electron energy establishing a benchmark for atomic calculations....

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Bibliographic Details
Published in:Physical review letters 2006-06, Vol.96 (25), p.253201-253201, Article 253201
Main Authors: Brown, G V, Beiersdorfer, P, Chen, H, Scofield, J H, Boyce, K R, Kelley, R L, Kilbourne, C A, Porter, F S, Gu, M F, Kahn, S M, Szymkowiak, A E
Format: Article
Language:English
Subjects:
BENCHMARKS
CALORIMETERS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CROSS SECTIONS
ELECTRON BEAMS
ELECTRONS
ENERGY DEPENDENCE
EXCITATION
IONS
IRON
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
RESONANCE
SIMULATION
SPECTRA
TRAPS
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Summary:By implementing a large-area, gain-stabilized microcalorimeter array on an electron beam ion trap, the electron-impact excitation cross sections for the dominant x-ray lines in the Fe XVII spectrum have been measured as a function of electron energy establishing a benchmark for atomic calculations. The results show that the calculations consistently predict the cross section of the resonance line to be significantly larger than measured. The lower cross section accounts for several problems found when modeling solar and astrophysical Fe XVII spectra.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.96.253201