2022
DOI: 10.1088/1361-6595/ac8f6c
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2D imaging of absolute methyl concentrations in nanosecond pulsed plasma by photo-fragmentation laser-induced fluorescence

Abstract: The methyl radical plays a central role in plasma-assisted hydrocarbon chemistry but is challenging to detect due to its high reactivity and strongly pre-dissociative electronically excited states. We report the development of a photo-fragmentation laser-induced fluorescence (PF-LIF) diagnostic for quantitative 2D imaging of methyl profiles in a plasma. This technique provides temporally and spatially resolved measurements of local methyl distributions, including in near-surface regions that are important for … Show more

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Cited by 11 publications
(7 citation statements)
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“…The synthetic spectrum is generated using PGOPHER software [32], with the pressure broadening coefficient measured in reference [8]. The rotational-translational temperature is inferred from the intensity ratio of R 11 (6) and P 33 (14) lines, labeled in figure 15, with the estimated uncertainty of ±20 K. The uncertainty is controlled by the N 2 (A, v = 0) population in the plasma and by the acoustic waves generated in the discharge section, which result in the laser beam steering. The temperature rise during the 3 kHz, 50-pulse discharge burst at the conditions of figures 7-10, due to the quenching and relaxation of the excited states generated in the plasma, is several tens of degrees, as summarized in table 1.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The synthetic spectrum is generated using PGOPHER software [32], with the pressure broadening coefficient measured in reference [8]. The rotational-translational temperature is inferred from the intensity ratio of R 11 (6) and P 33 (14) lines, labeled in figure 15, with the estimated uncertainty of ±20 K. The uncertainty is controlled by the N 2 (A, v = 0) population in the plasma and by the acoustic waves generated in the discharge section, which result in the laser beam steering. The temperature rise during the 3 kHz, 50-pulse discharge burst at the conditions of figures 7-10, due to the quenching and relaxation of the excited states generated in the plasma, is several tens of degrees, as summarized in table 1.…”
Section: Resultsmentioning
confidence: 99%
“…This limits the confidence in the predictions of CO and CH 3 radical yield in the plasma. Measurements of time-resolved, absolute CO [5] and CH 3 [6] number densities at well characterized plasma conditions may improve considerably the understanding of the underlying kinetics. Complementary measurements of the absolute number density of the metastable excited electronic state of nitrogen, N 2 (A 3 Σ u + ), in these plasmas can help characterize the yield of the molecular dissociation processes.…”
Section: Introductionmentioning
confidence: 99%
“…The detection of CH 4 dissociation products, such as CH 3 and CH radicals, requires more sophisticated laser techniques (e.g. laser-induced fluorescence (LIF) [64], coherent anti-Stokes Raman scattering [65][66][67] and photo-fragmentation LIF [68]), which are currently not suitable for our setup. Therefore, the quantification of the species formed in the plasma upon the addition of CH 4 and the full characterization of the gas mixture are delegated to future studies.…”
Section: Raman Scatteringmentioning
confidence: 99%
“…Qualitative 2D imaging of CH 3 has been demonstrated on laminar and turbulent methaneair flames [33][34][35]. Van den Bekerom et al have recently published quantitative CH 3 PF-LIF measurements in a plasma at low pressure [36]. The absolute calibration was done by producing a known CH 3 profile by photo-dissociation of acetone vapor.…”
Section: Introductionmentioning
confidence: 99%