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Measurements of Gaseous Hydrogen–Nitrogen Laser-Plasma

Physics and Astronomy Department, University of Tennessee, University of Tennessee Space Institute, Center for Laser Applications, 411 B.H. Goethert Pkwy, Tullahoma, TN 37388, USA
Atoms 2019, 7(3), 61; https://doi.org/10.3390/atoms7030061
Received: 14 June 2019 / Revised: 26 June 2019 / Accepted: 26 June 2019 / Published: 29 June 2019
(This article belongs to the Special Issue Laser Plasma Spectroscopy Applications)
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Abstract

This work communicates laser-plasma experiments in a gaseous mixture of hydrogen and nitrogen. Time-resolved spectroscopy measures the first four Balmer-series hydrogen lines together with selected neutral and ionized nitrogen lines. Optical breakdown plasma is generated in a 1:1 hydrogen:nitrogen mixture at ambient temperature and 0.27-atm pressure. Time-resolved spectroscopy records emitted radiation with spatial resolution along the slit height for the H α , H β , H γ , and H δ lines. For 13 selected time delays from 0.25 μ s to 3.25 μ s and 0.025 μ s gate-widths, micro-plasma diagnostics is evaluated. Of interest are the peak separation and width of H δ and width of H γ for electron densities in the range of 0.1 to 1.0 × 10 17 cm 3 , and comparisons with H β and H α diagnostics. Integral inversions interrogate spatial distributions of the plasma expansion. Applications include laboratory and stellar astrophysics plasma diagnosis. View Full-Text
Keywords: atomic and molecular spectroscopy; time-resolved spectroscopy; laser-plasma; laser-induced optical breakdown; stellar astrophysics spectra; white dwarf stars; hydrogen atomic and molecular spectroscopy; time-resolved spectroscopy; laser-plasma; laser-induced optical breakdown; stellar astrophysics spectra; white dwarf stars; hydrogen
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Parigger, C.G. Measurements of Gaseous Hydrogen–Nitrogen Laser-Plasma. Atoms 2019, 7, 61.

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