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Title: High-resolution Charge Exchange Spectra with L-shell Nickel Show Striking Differences from Models

Abstract

This work reports on the first high-resolution laboratory spectra of X-ray emission following L-shell charge exchange between nickel ions and neutral H 2 and He. We employ the commonly used charge exchange models found in xspec and spex, acx and spex-cx, to simulate our experimental results. We show that significant differences between data and models exist in both line energies and strengths. Specifically, we find that configuration mixing may play an important role in generating lines from core-excited states, and may be improperly treated in models. These conclusions imply that if applied to astrophysical data, these models may lead to incorrect assumptions of the physical and chemical parameters of the region of interest.

Authors:
 [1]; ORCiD logo [2];  [2]; ORCiD logo [3]; ORCiD logo [2];  [4];  [4];  [5];  [2];  [4]
  1. IRAP CNRS, Toulouse (France)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Universities Space Research Association, Columbia, MD (United States)
  4. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); CRESST and Univ. of Maryland Baltimore County, Baltimore, MD (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1545290
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 868; Journal Issue: 2; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
atomic processes; line: formation; methods: laboratory: atomic

Citation Formats

Betancourt-Martinez, G. L., Beiersdorfer, P., Brown, G. V., Cumbee, R. S., Hell, N., Kelley, R. L., Kilbourne, C. A., Leutenegger, M. A., Lockard, T. E., and Porter, F. S. High-resolution Charge Exchange Spectra with L-shell Nickel Show Striking Differences from Models. United States: N. p., 2018. Web. doi:10.3847/2041-8213/aaef82.
Betancourt-Martinez, G. L., Beiersdorfer, P., Brown, G. V., Cumbee, R. S., Hell, N., Kelley, R. L., Kilbourne, C. A., Leutenegger, M. A., Lockard, T. E., & Porter, F. S. High-resolution Charge Exchange Spectra with L-shell Nickel Show Striking Differences from Models. United States. doi:10.3847/2041-8213/aaef82.
Betancourt-Martinez, G. L., Beiersdorfer, P., Brown, G. V., Cumbee, R. S., Hell, N., Kelley, R. L., Kilbourne, C. A., Leutenegger, M. A., Lockard, T. E., and Porter, F. S. Tue . "High-resolution Charge Exchange Spectra with L-shell Nickel Show Striking Differences from Models". United States. doi:10.3847/2041-8213/aaef82.
@article{osti_1545290,
title = {High-resolution Charge Exchange Spectra with L-shell Nickel Show Striking Differences from Models},
author = {Betancourt-Martinez, G. L. and Beiersdorfer, P. and Brown, G. V. and Cumbee, R. S. and Hell, N. and Kelley, R. L. and Kilbourne, C. A. and Leutenegger, M. A. and Lockard, T. E. and Porter, F. S.},
abstractNote = {This work reports on the first high-resolution laboratory spectra of X-ray emission following L-shell charge exchange between nickel ions and neutral H2 and He. We employ the commonly used charge exchange models found in xspec and spex, acx and spex-cx, to simulate our experimental results. We show that significant differences between data and models exist in both line energies and strengths. Specifically, we find that configuration mixing may play an important role in generating lines from core-excited states, and may be improperly treated in models. These conclusions imply that if applied to astrophysical data, these models may lead to incorrect assumptions of the physical and chemical parameters of the region of interest.},
doi = {10.3847/2041-8213/aaef82},
journal = {The Astrophysical Journal. Letters},
number = 2,
volume = 868,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
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This content will become publicly available on November 20, 2019
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