2023
DOI: 10.1088/1361-6595/ace9f8
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Laser absorption spectroscopy for plasma-assisted thermochemical treatment. Part II.: Impact of the carbon and water contaminants on a low-pressure N2–H2 discharge

Abstract: The density evolution of HCN, NH3, H2O and CO molecules over time was monitored by laser absorption spectroscopy (LAS) in a low pressure DC pulsed discharge in N2-H2 gas mixtures with addition of CH4 or O2. The discharge was maintained in an industrial-scale, active screen plasma nitrocarburizing (ASPNC) reactor with a steel active screen (AS). The measured species densities were analysed using a simplified kinetic model that includes three characteristic times for chemical processes in the ASPNC reactor. The s… Show more

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Cited by 4 publications
(3 citation statements)
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“…Finally, considering that absorption spectroscopy is a lineof-sight method with an integrating character, local heating in the active plasma region may be expected to induce a temperature gradient, in particular at high plasma powers. If this is the case, the measured absorption profiles, particularly their Doppler width, will respond differently to such a gradient based on whether the probed transitions are from a hot band or a fundamental band, or whether they are for high J or low J transitions [46][47][48]. For instance, higher J and hot band transitions are predicted to include more contribution from the hotter region in the reactor than the low J transitions of the fundamental band, as expected from the dependence of their spectral line intensity on temperature [40].…”
Section: Non-thermal Population Of Rovibrational Levels Of Hcnmentioning
confidence: 99%
“…Finally, considering that absorption spectroscopy is a lineof-sight method with an integrating character, local heating in the active plasma region may be expected to induce a temperature gradient, in particular at high plasma powers. If this is the case, the measured absorption profiles, particularly their Doppler width, will respond differently to such a gradient based on whether the probed transitions are from a hot band or a fundamental band, or whether they are for high J or low J transitions [46][47][48]. For instance, higher J and hot band transitions are predicted to include more contribution from the hotter region in the reactor than the low J transitions of the fundamental band, as expected from the dependence of their spectral line intensity on temperature [40].…”
Section: Non-thermal Population Of Rovibrational Levels Of Hcnmentioning
confidence: 99%
“…All data on the obtained densities are available at [48]. In part II [23], only averaged densities will be presented and their behavior on experimental parameters will be discussed.…”
Section: For Cold Lines S(296mentioning
confidence: 99%
“…The current manuscript focusses on the interpretation of the spectroscopic measurements and on obtaining species densities. The second manuscript [23] is devoted to the analysis of the time evolution of the densities for a better understanding of nitrocarburizing processes. Preliminary results of the work were reported in [24].…”
Section: Introductionmentioning
confidence: 99%