scholarly journals Laser-Plasma Spectroscopy of Hydroxyl with Applications

2020 ◽  
Author(s):  
Christian G. Parigger ◽  
Christopher M. Helstern ◽  
Benjamin S. Jordan ◽  
David M. Surmick ◽  
Robert Splinter
Keyword(s):  
Time Delays ◽  
Line Strength ◽  
Emission Spectra ◽  
Laser Pulses ◽  
Supplementary File ◽  
Plasma Spectroscopy ◽  
Air Plasma ◽  
Strength Data ◽  
Laser Induced Plasma ◽  
Plasma Measurements

This article discusses laser-induced laboratory-air plasma measurements and analysis of hydroxyl (OH) ultraviolet spectra. 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 computation of the emission spectra utilizes line strength data that are communicated as a supplementary file. Applications of detailed OH computations include laser-induced plasma and combustion analyses, to name but two applications.

scholarly journals Laser-Plasma Spectroscopy of Hydroxyl with Applications

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 988 ◽  
Author(s):  
Christian G. Parigger ◽  
Christopher M. Helstern ◽  
Benjamin S. Jordan ◽  
David M. Surmick ◽  
Robert Splinter
Keyword(s):  
Line Strength ◽  
Emission Spectra ◽  
Laser Pulses ◽  
Supplementary File ◽  
Air Plasma ◽  
Condon Factors ◽  
Recorded Data ◽  
First Time ◽  
Plasma Measurements ◽  
Line Strengths

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.

Provenance Characterization of Archaeological Ceramics by Laser Induced Plasma Spectroscopy

2006 ◽  
Vol 514-516 ◽  
pp. 1638-1642
Author(s):  
Ana J. López ◽  
Alberto Ramil ◽  
Gines Nicolas ◽  
Mari Paz Mateo ◽  
Victor Piñon ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Emission Spectra ◽  
Plasma Spectroscopy ◽  
Archaeological Ceramics ◽  
X Ray ◽  
Laser Induced Plasma ◽  
Characteristic Emission ◽  
Scanning Electron

Archaeological ceramics Terra Sigillata manufactured in different production centres have been studied by “laser induced plasma spectroscopy” (LIPS). The aim of this work is to demonstrate the capability of LIPS for the classification of pottery shreds in function of their provenance. Characteristic emission spectra of different pottery groups were obtained and simple linear correlation methods were used for grouping samples. In addition, complementary scanning electron microscopy coupled with energy-dispersive X-ray spectrometry (SEM-EDX) analysis were performed to obtain morphological features and to confirm chemical results

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

2019 ◽  
Author(s):  
Christian G. Parigger ◽  
Christopher M. Helstern ◽  
Ghaneshwar Gautam
Keyword(s):  
Atomic Hydrogen ◽  
Emission Spectroscopy ◽  
Local Equilibrium ◽  
Emission Spectra ◽  
Optical Emission ◽  
Laser Pulses ◽  
Nano Particles ◽  
Nanosecond Laser ◽  
Laser Induced Plasma ◽  
Nanosecond Laser Pulses

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.

scholarly journals Time-Resolved Emission Spectroscopy of Atomic and Molecular Species in Laser-Induced Plasma

2018 ◽  
Author(s):  
Christian Parigger ◽  
Ghaneshwar Gautam ◽  
Christopher M Helstern
Keyword(s):  
Emission Spectroscopy ◽  
Local Equilibrium ◽  
Optical Breakdown ◽  
Emission Spectra ◽  
Laser Pulses ◽  
Nano Particles ◽  
Nanosecond Laser ◽  
Pure Hydrogen ◽  
Laser Induced Plasma ◽  
Nanosecond Laser Pulses

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 milli-Joules, 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). The atomic H spectra, collected following optical breakdown in ultra-high-pure hydrogen and 9:1 mixtures of ultra-pure hydrogen and nitrogen gases, indicate spherical 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.

scholarly journals High Energy Double Peak Pulse Laser Induced Plasma Spectroscopy for Metal Characterization Using a Passively Q-Switched Laser Source and CCD Detector

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3634
Author(s):  
Juri Agresti ◽  
Andrea Azelio Mencaglia ◽  
Salvatore Siano
Keyword(s):  
Pulse Laser ◽  
Yttrium Aluminum Garnet ◽  
Low Cost ◽  
Laser Pulses ◽  
High Energy ◽  
Laser Source ◽  
Plasma Spectroscopy ◽  
Double Peak ◽  
Temporal Separation ◽  
Laser Induced Plasma

Here, the development and testing of a portable double peak pulse laser induced plasma spectroscopy (DPP-LIPS) based on passively Q-switched Nd:YAG (Neodymium-doped Yttrium Aluminum Garnet) laser excitation is reported. The latter delivered structured laser pulses at a repetition rate of up to 20 Hz, including two energy peaks of about 100 mJ each with a relative temporal spacing of about 80 µs. Plasma spectra were collected using a low-cost Czerny–Turner spectrometer equipped with a non-intensified CCD (Charge-Coupled Device) array. Such a DPP-LIPS setup is technologically simpler and cheaper than the usual ones. Despite the relatively large temporal separation between the mentioned laser peaks, significant spectral intensity enhancements with respect to the usual single peak pulse configuration were observed. The amplification factor measured ranged between 2 and 10, depending on the specific emission peaks and the Q-switched configuration, and a consequent significant improvement of the detection limit of trace elements was observed. The instrument was calibrated for the quantitative analysis of copper alloy through systematic measurements carried out on reference samples and was then tested in an example archaeometric characterization of a statuette from the Egyptian Museum of Florence.

scholarly journals Application of laser-induced plasma spectroscopy to detect contaminants in food

2021 ◽  
Author(s):  
Mangasi Alion Marpaung ◽  
Erfan Handoko ◽  
Marincan Pardede
Keyword(s):  
Plasma Spectroscopy ◽  
Laser Induced Plasma

Optical, electrochemical and third-order nonlinear optical studies of triphenylamine substituted zinc phthalocyanine

2016 ◽  
Vol 20 (08n11) ◽  
pp. 1173-1181 ◽  
Author(s):  
Narra Vamsi Krishna ◽  
Puliparambil Thilakan Anusha ◽  
S. Venugopal Rao ◽  
L. Giribabu
Keyword(s):  
Nonlinear Optical ◽  
Emission Spectra ◽  
Optical Emission ◽  
Soret Band ◽  
Laser Pulses ◽  
Zinc Phthalocyanine ◽  
Third Order ◽  
Time Resolved ◽  
Nlo Properties ◽  
Scan Data

Zinc phthalocyanine possessing triphenylamine at its peripheral position has been synthesized and its optical, emission, electrochemical and third-order nonlinear optical (NLO) properties were investigated. Soret band was broadened due to the presence of triphenylamine moiety. Electrochemical properties indicated that both oxidation and reduction processes were ring centered. Emission spectra were recorded in different solvents and the fluorescence yields obtained were in the range of 0.02–0.17 while the time-resolved fluorescence data revealed radiative lifetimes of typically few ns. Third-order NLO properties of this molecule have been examined using the Z-scan technique with picosecond (ps) and femtoseocnd (fs) pulses. Closed and open aperture Z-scan data were recorded with 2 ps/1 50 fs laser pulses at a wavelength of 800 nm and NLO coefficients were extracted from both the data. Our data clearly suggests the potential of this molecule for photonics applications.

A comparison of nanosecond and femtosecond laser-induced plasma spectroscopy of brass samples

2000 ◽  
Vol 55 (11) ◽  
pp. 1771-1785 ◽  
Author(s):  
V Margetic ◽  
A Pakulev ◽  
A Stockhaus ◽  
M Bolshov ◽  
K Niemax ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Plasma Spectroscopy ◽  
Laser Induced Plasma
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