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Correcting the Input Data for Calculating the Asymmetry of Hydrogenic Spectral Lines in Plasmas
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Atoms 2018, 6(2), 21; https://doi.org/10.3390/atoms6020021

Improving the Method of Measuring the Electron Density via the Asymmetry of Hydrogenic Spectral Lines in Plasmas by Allowing for Penetrating Ions

Physics Department, 206 Allison Lab, Auburn University, Auburn, AL 36849, USA
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Received: 9 March 2018 / Revised: 1 April 2018 / Accepted: 8 April 2018 / Published: 18 April 2018
(This article belongs to the Special Issue Stark Broadening of Spectral Lines in Plasmas)
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Abstract

There was previously proposed and experimentally implemented a new diagnostic method for measuring the electron density Ne using the asymmetry of hydrogenic spectral lines in dense plasmas. Compared to the traditional method of deducing Ne from the experimental widths of spectral lines, the new method has the following advantages. First, the traditional method requires measuring widths of at least two spectral lines (to isolate the Stark broadening from competing broadening mechanisms), while for the new diagnostic method it is sufficient to obtain the experimental profile of just one spectral line. Second, the traditional method would be difficult to implement if the center of the spectral lines was optically thick, while the new diagnostic method could still be used even in this case. In the theory underlying this new diagnostic method, the contribution of plasma ions to the spectral line asymmetry was calculated only for configurations where the perturbing ions were outside the bound electron cloud of the radiating atom/ion (non-penetrating configurations). In the present paper, we take into account the contribution to the spectral line asymmetry from penetrating configurations, where the perturbing ion is inside the bound electron cloud of the radiating atom/ion. We show that in high-density plasmas, the allowance for penetrating ions can result in significant corrections to the electron density deduced from the spectral line asymmetry. View Full-Text
Keywords: asymmetry of spectral lines; penetrating ions; spectroscopic diagnostics of plasmas; electron density measurements asymmetry of spectral lines; penetrating ions; spectroscopic diagnostics of plasmas; electron density measurements
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Sanders, P.; Oks, E. Improving the Method of Measuring the Electron Density via the Asymmetry of Hydrogenic Spectral Lines in Plasmas by Allowing for Penetrating Ions. Atoms 2018, 6, 21.

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