The N2 second positive (C3Π  → B3Π ) system reviewed: Improved data and analysis

Ventura, Laiz R.; Fellows, C. E.

doi:10.1016/j.jqsrt.2019.106645

Cited by 12 publications

(15 citation statements)

References 17 publications

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“…While for the fs-Solstice spectra, four lines are identified within the CN molecular band where two of them correlate to heat value and not to carbon content showing higher selectiveness of the fs-LA relative to its ns-counterpart. Another four lines are unforeseen emissions from the second positive band system 30 , 31 ( transition) of N 2 . It means that 7/10 and 8/10 of the most correlated lines for carbon content and heat value respectively are molecular lines for fs-Solstice spectra.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of femtosecond laser-induced breakdown spectroscopy system as an offline coal analyzer

Sheta

Hou

Wang

et al. 2021

Sci Rep

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Developments in femtosecond laser induced breakdown spectroscopy (fs-LIBS) applications during the last two decades have further centered on innovative métier tie-in to the advantageous properties of femtosecond laser ablation (fs-LA) introduced into LIBS. Yet, for industrially-oriented application like coal analysis, no research has exposed to view the analytical capabilities of fs-LA in enhancing the physical processes of coal ablation and the impact into quantitative correlation of spectra and data modeling. In a huge coal market, fast and accurate analysis of coal property is eminently important for coal pricing, combustion optimization, and pollution reduction. Moreover, there is a thirst need of precision standardization for coal analyzers in use. In this letter, the analytical performance of a one-box femtosecond laser system is evaluated relative to an industrially applied coal analyzer based on five objectives/measures: spectral correlation, relative sensitivity factors, craters topology, plasma parameters, and repeatability. Despite high-threshold operation parameters of the fs system, competitive results are achieved compared to the optimized analytical conditions of the ns-coal analyzer. Studies targeting the in-field optimization of fs-LIBS systems for coal analysis can potentially provide insights into fs-plasma hydrodynamics under harsh conditions, instrumental customization, and pave the way for a competitive next-generation of coal analyzers.

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Section: Resultsmentioning

confidence: 99%

Evaluation of femtosecond laser-induced breakdown spectroscopy system as an offline coal analyzer

Sheta

Hou

Wang

et al. 2021

Sci Rep

View full text Add to dashboard Cite

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“…The peaks were identified by comparing the measured and calculated wavelengths. The wavelengths of the electronic–vibrational transitions were calculated using vibrational constants of the nitrogen molecule [ 32 , 33 ].…”

Section: Resultsmentioning

confidence: 99%

Non-Thermal Plasma Sources Based on Cometary and Point-to-Ring Discharges

et al. 2021

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A non-thermal plasma (NTP) is a promising tool against the development of bacterial, viral, and fungal diseases. The recently revealed development of microbial resistance to traditional drugs has increased interest in the use of NTPs. We have studied and compared the physical and microbicidal properties of two types of NTP sources based on a cometary discharge in the point-to-point electrode configuration and a corona discharge in the point-to-ring electrode configuration. The electrical and emission properties of both discharges are reported. The microbicidal effect of NTP sources was tested on three strains of the bacterium Staphylococcus aureus (including the methicillin-resistant strain), the bacterium Pseudomonas aeruginosa, the yeast Candida albicans, and the micromycete Trichophyton interdigitale. In general, the cometary discharge is a less stable source of NTP and mostly forms smaller but more rapidly emerging inhibition zones on agar plates. Due to the point-to-ring electrode configuration, the second type of discharge has higher stability and provides larger affected but often not completely inhibited zones. However, after 60 min of exposure, the NTP sources based on the cometary and point-to-ring discharges showed a similar microbicidal effect for bacteria and an individual effect for microscopic fungi.

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“…An example of an emission spectrum at 6.4 W input power and in pure N2 is shown in Figure 35, in line with literature [49,76] . As follows from the emission spectrum, the most pronounced peaks are found in the regime 290-400 nm, which corresponds to the second positive band from an activated neutral N2 * molecule (C 3 ΠuB 3 Πg) [342] . This implies that photons are emitted upon plasma-activated N2 falling back from an electronically and/or vibrationally excited state to a lower energy state of N2.…”

Section: Plasma Characterizationmentioning

confidence: 77%

Nitrogen fixation with renewable electricity: Plasma catalysis as an alternative for small-scale ammonia synthesis?

Rouwenhorst

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Ammonia is one of the most produced chemicals, mainly synthesized for fertilizer applications. Renewable ammonia is considered as a zero carbon fuel and hydrogen carriers of the future. However, renewable resources such as wind and solar are fluctuating. This has spurred research interest in alternative technologies for renewable ammonia production methods better suited to fluctuating electricity sources. Plasma catalysis is proposed as an option for electricity-driven ammonia synthesis. Lastly, the outline of the thesis is highlighted.

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The N2 second positive (C3Π  → B3Π ) system reviewed: Improved data and analysis

Cited by 12 publications

References 17 publications

Evaluation of femtosecond laser-induced breakdown spectroscopy system as an offline coal analyzer

Evaluation of femtosecond laser-induced breakdown spectroscopy system as an offline coal analyzer

Non-Thermal Plasma Sources Based on Cometary and Point-to-Ring Discharges

Nitrogen fixation with renewable electricity: Plasma catalysis as an alternative for small-scale ammonia synthesis?

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The N2 second positive (C3Π → B3Π ) system reviewed: Improved data and analysis

Cited by 12 publications

References 17 publications

Evaluation of femtosecond laser-induced breakdown spectroscopy system as an offline coal analyzer

Evaluation of femtosecond laser-induced breakdown spectroscopy system as an offline coal analyzer

Non-Thermal Plasma Sources Based on Cometary and Point-to-Ring Discharges

Nitrogen fixation with renewable electricity: Plasma catalysis as an alternative for small-scale ammonia synthesis?

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The N2 second positive (C3Π  → B3Π ) system reviewed: Improved data and analysis