Effect of Electron Capture on Spectral Line Broadening in Hot Dense Plasmas

Accurate calculation of spectral line broadening is important for many hot, dense plasma applications. However, calculated line widths have significantly underestimated measured widths for Δn=0 lines of Li-like ions, which is known as the isolated-line problem. In this Letter, scrutinization of the...

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Bibliographic Details
Published in:Physical review letters 2020-02, Vol.124 (5), p.055003-055003, Article 055003
Main Authors: Gomez, T A, Nagayama, T, Fontes, C J, Kilcrease, D P, Hansen, S B, Zammit, M C, Fursa, D V, Kadyrov, A S, Bray, I
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Atomic properties
atomic spectra
Beta decay
Dense plasmas
electron & positron scattering
Electron capture
Electron energy
electronic excitation & ionization
electronic transitions
high-energy-density plasmas
laboratory studies of space & astrophysical plasmas
Line broadening
Line spectra
Mathematical analysis
Plasma
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Summary:Accurate calculation of spectral line broadening is important for many hot, dense plasma applications. However, calculated line widths have significantly underestimated measured widths for Δn=0 lines of Li-like ions, which is known as the isolated-line problem. In this Letter, scrutinization of the line-width derivation reveals that the commonly used expression neglects a potentially important contribution from electron-capture. Line-width calculations including this process are performed with two independent codes, both of which removed the discrepancies at temperatures below 10 eV. The revised calculations also suggest the remaining discrepancy scales more strongly with electron temperature than the atomic number as was previously suggested.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.124.055003