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Title: Measurement of the radiative decay and energy of the metastable $${(2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{(J=0)}$$ level in Fe XVII

Measurements at the Livermore electron beam ion trap have been performed in order to infer the energy and the radiative lifetime of the $${(1{s}^{2}2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=0}$$ level in the Fe xvii spectrum. This is the longest-lived level in the neonlike iron ion, and its radiative decay produces the Fe xvii line at 1153 Å, feeding the population of the $${(1{s}^{2}2{s}^{2}2{p}_{3/2}^{5}3{s}_{1/2})}_{J=1}$$ upper level of one of the most prominent lines in the Fe xvii L-shell X-ray spectrum, commonly dubbed $3G$. In the presence of a strong ($$\geqslant $$ few kG) magnetic field, the $${(1{s}^{2}2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=0}$$ level has a finite probability to decay directly to the $${(1{s}^{2}2{s}^{2}2{p}^{6})}_{J=0}$$ neonlike ground level via the emission of an L-shell X-ray. Our measurements allow us to observe this X-ray line in the Fe xvii L-shell spectrum and from it to infer the radiative rate for the magnetic dipole decay of the $${(1{s}^{2}2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=0}$$ level to the $${(1{s}^{2}2{s}^{2}2{p}_{3/2}^{5}3{s}_{1/2})}_{J=1}$$. Our result of $$(1.45\pm 0.15)\times {10}^{4}$$ s-1 is in agreement with predictions. We have also measured the wavelength of the associated X-ray line to be 16.804 ± 0.002 Å, which means that the line is displaced 1.20 ± 0.05 eV from the neighboring $${(2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=1}\to {(2{s}^{2}2{p}^{6})}_{J=0}$$ transition, commonly labeled $3F$. Furthermore, from our measurement, we infer 5950570 ± 710 cm-1 for the energy of the $${(1{s}^{2}2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=0}$$ level.
Authors:
 [1] ;  [2] ; ORCiD logo [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Max-Planck-Institut fur Kernphysik, Heidelberg (Germany)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Ruhr-Univ. Bochum (Germany)
Publication Date:
Report Number(s):
LLNL-JRNL-676699
Journal ID: ISSN 1538-4357
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 817; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS; atomic data; atomic processes; line: formation; X-rays: general
OSTI Identifier:
1411708

Beiersdorfer, P., Lopez-Urrutia, J. R. Crespo, and Trabert, E.. Measurement of the radiative decay and energy of the metastable ${(2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{(J=0)}$ level in Fe XVII. United States: N. p., Web. doi:10.3847/0004-637X/817/1/67.
Beiersdorfer, P., Lopez-Urrutia, J. R. Crespo, & Trabert, E.. Measurement of the radiative decay and energy of the metastable ${(2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{(J=0)}$ level in Fe XVII. United States. doi:10.3847/0004-637X/817/1/67.
Beiersdorfer, P., Lopez-Urrutia, J. R. Crespo, and Trabert, E.. 2016. "Measurement of the radiative decay and energy of the metastable ${(2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{(J=0)}$ level in Fe XVII". United States. doi:10.3847/0004-637X/817/1/67. https://www.osti.gov/servlets/purl/1411708.
@article{osti_1411708,
title = {Measurement of the radiative decay and energy of the metastable ${(2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{(J=0)}$ level in Fe XVII},
author = {Beiersdorfer, P. and Lopez-Urrutia, J. R. Crespo and Trabert, E.},
abstractNote = {Measurements at the Livermore electron beam ion trap have been performed in order to infer the energy and the radiative lifetime of the ${(1{s}^{2}2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=0}$ level in the Fe xvii spectrum. This is the longest-lived level in the neonlike iron ion, and its radiative decay produces the Fe xvii line at 1153 Å, feeding the population of the ${(1{s}^{2}2{s}^{2}2{p}_{3/2}^{5}3{s}_{1/2})}_{J=1}$ upper level of one of the most prominent lines in the Fe xvii L-shell X-ray spectrum, commonly dubbed $3G$. In the presence of a strong ($\geqslant $ few kG) magnetic field, the ${(1{s}^{2}2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=0}$ level has a finite probability to decay directly to the ${(1{s}^{2}2{s}^{2}2{p}^{6})}_{J=0}$ neonlike ground level via the emission of an L-shell X-ray. Our measurements allow us to observe this X-ray line in the Fe xvii L-shell spectrum and from it to infer the radiative rate for the magnetic dipole decay of the ${(1{s}^{2}2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=0}$ level to the ${(1{s}^{2}2{s}^{2}2{p}_{3/2}^{5}3{s}_{1/2})}_{J=1}$. Our result of $(1.45\pm 0.15)\times {10}^{4}$ s-1 is in agreement with predictions. We have also measured the wavelength of the associated X-ray line to be 16.804 ± 0.002 Å, which means that the line is displaced 1.20 ± 0.05 eV from the neighboring ${(2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=1}\to {(2{s}^{2}2{p}^{6})}_{J=0}$ transition, commonly labeled $3F$. Furthermore, from our measurement, we infer 5950570 ± 710 cm-1 for the energy of the ${(1{s}^{2}2{s}^{2}2{p}_{1/2}^{5}3{s}_{1/2})}_{J=0}$ level.},
doi = {10.3847/0004-637X/817/1/67},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 817,
place = {United States},
year = {2016},
month = {1}
}