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Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma

1
Department of Physics and Astronomy, University of Tennessee/University of Tennessee Space Institute, 411 B. H. Goethert Parkway, Tullahoma, TN 37388, USA
2
Fort Peck Community College, 605 Indian Avenue, Poplar, MT 59255, USA
*
Author to whom correspondence should be addressed.
Atoms 2019, 7(3), 74; https://doi.org/10.3390/atoms7030074
Received: 24 June 2019 / Revised: 24 July 2019 / Accepted: 31 July 2019 / Published: 2 August 2019
(This article belongs to the Special Issue Laser Plasma Spectroscopy Applications)
In this study, we examine the atomic and molecular signatures in laser-induced plasma. Abel inversions of measured line-of-sight data reveal insight into the radial plasma distribution. Laser-plasma is generated with 6 ns, Q-switched Nd:YAG radiation with energies in the range of 100 to 800 mJ. Temporally- and spatially-resolved emission spectroscopy investigates expansion dynamics. Specific interests include atomic hydrogen (H) and cyanide (CN). Atomic hydrogen spectra indicate axisymmetric shell structures and isentropic expansion of the plasma kernel. The recombination radiation of CN emanates within the first 100 nanoseconds for laser-induced breakdown in a 1:1 mole ratio CO2:N2 gas mixture. CN excitation temperatures are determined from fitting recorded and computed spectra. Chemical equilibrium mole fractions of CN are computed for air and the CO2:N2 gas mixture. Measurements utilize a 0.64-m Czerny–Turner type spectrometer and an intensified charge-coupled device. View Full-Text
Keywords: laser-induced plasma; atomic spectroscopy; molecular spectroscopy; cyanide; hydrogen; carbon laser-induced plasma; atomic spectroscopy; molecular spectroscopy; cyanide; hydrogen; carbon
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Parigger, C.G.; Helstern, C.M.; Gautam, G. Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma. Atoms 2019, 7, 74.

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