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

Abstract

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 up to greater than three times the threshold energy, establishing a benchmark for atomic calculations. The results reveal a consistent overestimation by recent calculations of the excitation cross section of the resonance transition, which is shown to be at the root of several long-standing problems associated with modeling solar and astrophysical Fe XVII spectra. The data do not show strong contributions from resonance excitation contrary to recent statements in the literature.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
886925
Report Number(s):
UCRL-JRNL-209228
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US0604146
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 96; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; BENCHMARKS; CROSS SECTIONS; ELECTRON BEAMS; ELECTRONS; EXCITATION; RESONANCE; SIMULATION; SPECTRA; THRESHOLD ENERGY

Citation Formats

Brown, G V, Beiersdorfer, P, Chen, H, Scofield, J H, Boyce, K R, Kelley, R L, Kilbourne, C A, Porter, F S, Kahn, S M, and Szymkowiak, A E. Energy-dependent excitation cross section measurements of the diagnostic lines of Fe XVII. United States: N. p., 2005. Web.
Brown, G V, Beiersdorfer, P, Chen, H, Scofield, J H, Boyce, K R, Kelley, R L, Kilbourne, C A, Porter, F S, Kahn, S M, & Szymkowiak, A E. Energy-dependent excitation cross section measurements of the diagnostic lines of Fe XVII. United States.
Brown, G V, Beiersdorfer, P, Chen, H, Scofield, J H, Boyce, K R, Kelley, R L, Kilbourne, C A, Porter, F S, Kahn, S M, and Szymkowiak, A E. 2005. "Energy-dependent excitation cross section measurements of the diagnostic lines of Fe XVII". United States. https://www.osti.gov/servlets/purl/886925.
@article{osti_886925,
title = {Energy-dependent excitation cross section measurements of the diagnostic lines of Fe XVII},
author = {Brown, G V and Beiersdorfer, P and Chen, H and Scofield, J H and Boyce, K R and Kelley, R L and Kilbourne, C A and Porter, F S and Kahn, S M and Szymkowiak, A E},
abstractNote = {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 up to greater than three times the threshold energy, establishing a benchmark for atomic calculations. The results reveal a consistent overestimation by recent calculations of the excitation cross section of the resonance transition, which is shown to be at the root of several long-standing problems associated with modeling solar and astrophysical Fe XVII spectra. The data do not show strong contributions from resonance excitation contrary to recent statements in the literature.},
doi = {},
url = {https://www.osti.gov/biblio/886925}, journal = {Physical Review Letters},
issn = {0031-9007},
number = ,
volume = 96,
place = {United States},
year = {Mon Jan 24 00:00:00 EST 2005},
month = {Mon Jan 24 00:00:00 EST 2005}
}