Molecular laser-induced breakdown spectroscopy

Parigger, Christian G.; Surmick, David M.; Helstern, Christopher M.; Gautam, Ghaneshwar; Bol’shakov, Alexander A.; Russo, Richard E.

doi:10.1016/b978-0-12-818829-3.00007-1

Cited by 14 publications

(22 citation statements)

References 95 publications

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“…Analogous to recently reported hydrogen nitrogen gaseous mixtures [30], the CN signals are weaker at the center and indicate a slightly lower temperature than at 0.85 mm. There appears to be residual interference from an atomic line at 386.2 nm that indicates the carbon line at the 193.09-nm line [20,21], measured in second order. Wavelength and detector system-sensitivity calibrated CN spectral data are Abel-inverted [16].…”

Section: Resultsmentioning

confidence: 96%

“…The CN recombination radiation occurs within the first 100 nanoseconds for laser-induced breakdown in 1:1 mole ratio CO 2 :N 2 gas mixtures at a pressure of 1 atm. Aspects of the analysis include Abel inversions [17][18][19][20][21] and computational modeling [6] of the plasma. Analysis of asymmetric plasma expansion would require Radon inverse transformations [22].…”

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confidence: 99%

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

Parigger

Helstern

Gautam

2019

Atoms

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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.

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Section: Resultsmentioning

confidence: 96%

mentioning

confidence: 99%

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

Parigger

Helstern

Gautam

2019

Atoms

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“…Fundamental analysis includes investigations of differences in spectra for OH and OD isotopologues using the program LIFBASE [11]. Applications include laser ablation molecular isotopic spectrometry (LAMIS) [12]. Recent OH data-base developments [13] for predictions with PGOPHER [14] indicate the continued interest in establishing well-defined parameters for computation of OH spectra for analysis of diatomic molecule signatures, viz.…”

Section: Introductionmentioning

confidence: 99%

Laser-Plasma Spectroscopy of Hydroxyl with Applications

et al. 2020

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This article discusses laser-induced laboratory-air plasma measurements and analysis of hydroxyl (OH) ultraviolet spectra. The computations of the OH spectra utilize line strength data that were developed previously and that are now communicated for the first time. The line strengths have been utilized extensively in interpretation of recorded molecular emission spectra and have been well-tested in laser-induced fluorescence applications for the purpose of temperature inferences from recorded data. Moreover, new experiments with Q-switched laser pulses illustrate occurrence of molecular recombination spectra for time delays of the order of several dozen of microseconds after plasma initiation. The OH signals occur due to the natural humidity in laboratory air. Centrifugal stretching of the Franck-Condon factors and r-centroids are included in the process of determining the line strengths that are communicated as a Supplementary File. Laser spectroscopy applications of detailed OH computations include laser-induced plasma and combustion analyses, to name but two applications. This work also includes literature references that address various diagnosis applications.

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“…Analogous to recently reported hydrogen nitrogen gaseous mixtures [30], the CN signals are weaker at the center and indicate a slightly lower temperature than for the 0.85 mm position. There appears to be residual interference from an atomic line at 386.2 nm that indicates the carbon line at 193.09-nm line [20,21], measured in second order. The recombination signals from the mixture are strongest near 7 kK.…”

Section: Resultsmentioning

confidence: 96%

“…The CN recombination radiation occurs within the first 100 nanoseconds for laser-induced breakdown in 1:1 CO2:N2 gas mixtures. Aspects of the analysis include Abel inversions [17][18][19][20][21] and computational modeling [6] of the plasma. Analysis of asymmetric plasma expansion would require Radon inverse transformations [22].…”

Section: Introductionmentioning

confidence: 99%

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

Parigger¹,

Helstern²,

Gautam³

2019

Preprint

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This work examines atomic and molecular signatures in laser-induced plasma in standard ambient temperature and pressure environments, including background contributions to the spectra that depend on the laser pulse-width. Investigations include solids, gases, and nano-particles. Abel inversions of measured line-of-sight data reveal insight into the radial plasma distribution. For nominal 6 nanosecond laser pulses and for pulse-energies in the range of 100 to 800 mJ, expansion dynamics and turbulence due to shock phenomena are elucidated to address local equilibrium details that are frequently assumed in spatially averaged emission spectroscopy. Chemical equilibrium computations reveal temperature dependence of selected plasma species. Specific interests include atomic hydrogen (H) and cyanide (CN). Atomic hydrogen spectra indicate axisymmetric shell structures and isentropic expansion of the plasma kernel over and above the usual shockwave. The recombination radiation of CN emanates within the first 100 nanoseconds for laser-induced breakdown in a 1:1 CO2:N2 gas mixture when using nanosecond laser pulses to create the micro-plasma. The micro-plasma is generated using 1064 nm, 150 mJ, 6 ns Q-switched Nd:YAG laser radiation. Measurements of the optical emission spectra utilize a 0.64 m Czerny-Turner type spectrometer and an intensified charge-coupled device.

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Molecular laser-induced breakdown spectroscopy

Cited by 14 publications

References 95 publications

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

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

Laser-Plasma Spectroscopy of Hydroxyl with Applications

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

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