Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma
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. Temp...
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doaj-de886c09fdd54031aa44e44cb3f524e22020-11-24T21:34:31ZengMDPI AGAtoms2218-20042019-08-01737410.3390/atoms7030074atoms7030074Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced PlasmaChristian G. Parigger0Christopher M. Helstern1Ghaneshwar Gautam2Department of Physics and Astronomy, University of Tennessee/University of Tennessee Space Institute, 411 B. H. Goethert Parkway, Tullahoma, TN 37388, USADepartment of Physics and Astronomy, University of Tennessee/University of Tennessee Space Institute, 411 B. H. Goethert Parkway, Tullahoma, TN 37388, USAFort Peck Community College, 605 Indian Avenue, Poplar, MT 59255, USAIn 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 CO<sub>2</sub>:N<sub>2</sub> 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 CO<sub>2</sub>:N<sub>2</sub> gas mixture. Measurements utilize a 0.64-m Czerny−Turner type spectrometer and an intensified charge-coupled device.https://www.mdpi.com/2218-2004/7/3/74laser-induced plasmaatomic spectroscopymolecular spectroscopycyanidehydrogencarbon |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Christian G. Parigger Christopher M. Helstern Ghaneshwar Gautam |
spellingShingle |
Christian G. Parigger Christopher M. Helstern Ghaneshwar Gautam Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma Atoms laser-induced plasma atomic spectroscopy molecular spectroscopy cyanide hydrogen carbon |
author_facet |
Christian G. Parigger Christopher M. Helstern Ghaneshwar Gautam |
author_sort |
Christian G. Parigger |
title |
Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma |
title_short |
Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma |
title_full |
Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma |
title_fullStr |
Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma |
title_full_unstemmed |
Temporally and Spatially Resolved Emission Spectroscopy of Hydrogen, Cyanide and Carbon in Laser-Induced Plasma |
title_sort |
temporally and spatially resolved emission spectroscopy of hydrogen, cyanide and carbon in laser-induced plasma |
publisher |
MDPI AG |
series |
Atoms |
issn |
2218-2004 |
publishDate |
2019-08-01 |
description |
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 CO<sub>2</sub>:N<sub>2</sub> 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 CO<sub>2</sub>:N<sub>2</sub> gas mixture. Measurements utilize a 0.64-m Czerny−Turner type spectrometer and an intensified charge-coupled device. |
topic |
laser-induced plasma atomic spectroscopy molecular spectroscopy cyanide hydrogen carbon |
url |
https://www.mdpi.com/2218-2004/7/3/74 |
work_keys_str_mv |
AT christiangparigger temporallyandspatiallyresolvedemissionspectroscopyofhydrogencyanideandcarboninlaserinducedplasma AT christophermhelstern temporallyandspatiallyresolvedemissionspectroscopyofhydrogencyanideandcarboninlaserinducedplasma AT ghaneshwargautam temporallyandspatiallyresolvedemissionspectroscopyofhydrogencyanideandcarboninlaserinducedplasma |
_version_ |
1725949053473128448 |