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• W3048272064 endingPage "095017" @default.
• W3048272064 startingPage "095017" @default.
• W3048272064 abstract "Abstract In situ quantum cascade laser (QCL) absorption spectroscopy is used to investigate the effect of admixed water in a pulsed CO 2 glow discharge on the vibrational excitation of CO 2 and CO and the conversion of CO 2 . Time-resolved transmittance spectra of the non-equilibrium CO 2 plasma are measured with a 100 μ s time resolution. A custom fitting routine is used to extract the time evolution of the gas temperature, rotational temperature and vibrational temperatures of CO 2 and CO, while the CO 2 conversion is determined from measured CO 2 and CO number densities. Rotational Raman scattering is additionally performed in the centre of the reactor to verify measured rotational and vibrational temperatures from line-of-sight absorption spectroscopy. The plasma is operated at 6.7 mbar, with up to 10% water admixed, and is pulsed with a 5–10 ms on-off cycle, with a current of 50 mA supplied during the plasma on-time. Vibrational temperatures and CO 2 conversion are not significantly affected by water admixtures below 0.5%. However, the asymmetric stretch temperature of CO 2 ( T 3 ) shows considerable quenching upon admixing 10% water vapour, with the maximum elevation above the rotational temperature ( T rot ) decreasing from 580 ± 86 K to 230 ± 63 K. For the vibrational temperature of CO ( T CO ), a similar trend is measured. However, the slopes of T 3 and T CO within the first few hundred μ s after the start of the plasma remain unchanged, even when admixing 10% water vapour, suggesting equal excitation of the vibrational modes through e–V and V–V interactions. The conversion decreases by almost a factor of 4 when admixing 10% water. We argue that vibrational quenching of CO 2 by water can explain part of the decrease. Changes in electron density and temperature and reactions between CO and OH can also play a role." @default.
• W3048272064 created "2020-08-13" @default.
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• W3048272064 date "2020-09-01" @default.
• W3048272064 modified "2023-09-30" @default.
• W3048272064 title "Vibrational quenching by water in a CO₂ glow discharge measured using quantum cascade laser absorption spectroscopy" @default.
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• W3048272064 doi "https://doi.org/10.1088/1361-6595/abad54" @default.
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