Plasma Measurements of the Fe xvii L-shell Emission and Blending with F viii and F ix

Beiersdorfer, P.; Lepson, J. K.; Gu, M. F.; Bitter, M.

doi:10.3847/1538-4357/aa9078

Plasma Measurements of the Fe xvii L-shell Emission and Blending with F viii and F ix

Journal Article · Thu Nov 16 00:00:00 EST 2017 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aa9078· OSTI ID:1472111

^[1]; Lepson, J. K. ^[2]; Gu, M. F. ^[2]; Bitter, M. ^[3]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California Berkeley, Berkeley, CA (United States)
Princeton Univ., Princeton, NJ (United States)

Here, we measured the L-shell emission spectrum of Fe xvii in a low-density, low-gradient magnetically confined laboratory plasma that contains predominately C, O, Fe, and Ni as trace elements and found excellent agreement with the relative spectral emission obtained in solar and astrophysical observations. However, we obtained spectra that appear to have an usually large $$1{s}^{2}2{s}^{2}2{p}_{1/2}^{5}3{d}_{3/2}\to 1{s}^{2}2{s}^{2}2{p}^{6}$$ Fe xvii resonance transition, which is commonly labeled $3C$, from hot plasmas that also contain fluorine. The wavelength of the Lyα feature of F ix is coincident with the wavelength of the Fe xvii line $3C$ within one part in 538, and its flux, therefore, enhances the Fe xvii resonance line. Moreover, the resonance and forbidden lines of F viii are close to the $$3s\to 2p$$ transitions in Fe xvii and may further alter the inferred apparent Fe xvii line ratios, particularly in spectrometers with moderate spectral resolution. The enhanced emission of line $3C$ can thus serve as a new spectral diagnostic for the detection of fluorine in astrophysical plasmas.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-09CH11466; AC52-07NA27344

OSTI ID:: 1472111

Alternate ID(s):: OSTI ID: 1810654

Report Number(s):: LLNL-JRNL--724159

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 850; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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