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doi:10.1016/b978-2-294-70689-9.00054-5

Cited by 1 publication

(1 citation statement)

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“…Source For the atomic oxygen multiplet the relative line strengths of the constituents are treated as fit parameters. In fact outside of the different fine structure components (relative ratios: 1:0.73:0.43 in order of decreasing photon energy [47]), there are, in addition to electron impact, other effects that cause different population of the upper excited state sublevels [48]-i.e. population of the 3p 5 P J states by the 5s 5 S level with different Einstein coefficients per transition.…”

Section: Transitionmentioning

confidence: 99%

Time-resolved optical emission spectroscopy in CO₂ nanosecond pulsed discharges

Ceppelli

Salden

Martini

et al. 2021

Plasma Sources Sci. Technol.

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Nanosecond repetitively pulsed discharges at atmospheric pressure have shown comparatively high performances for CO2 reduction to CO and O2. However, mechanisms of CO2 dissociation in these transient discharges are still a matter of discussion. In the present work, we have used time-resolved optical emission spectroscopy to investigate the CO2 discharge progression from the initial breakdown event to the final post-discharge. We discover a complex temporal structure of the spectrally resolved light, which gives some insights into the underlying electron and chemical kinetics. We could estimate the electron density using the Stark broadening of O and C lines and the electron temperature with C+ and C++ lines. By adding a small amount of nitrogen, we could also monitor the time evolution of the gas temperature using the second positive system bands of N2. We conclude that the discharge evolves from a breakdown to a spark phase, the latter being characterised by a peak electron density around 1018 cm−3 and a mean electron temperature around 2 eV. The spark phase offers beneficial conditions for vibrationally enhanced dissociation, which might explain the high CO2 conversion observed in these plasma discharges.

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Section: Transitionmentioning

confidence: 99%