XLIII. Excitation of the Balmer series lines in hydrogen spark channels

Craggs, J D; Williams, G C; Hopwood, W.

doi:10.1080/14786444808561077

Cited by 8 publications

(1 citation statement)

References 18 publications

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“…Wünderlich found that the electron collision excitation from H (Equation ) is the dominant excitation channel in ECR plasma using a collisional radiative model . Craggs et al investigated atmospheric hydrogen spark discharge, and he also suggested the electron excitation appears to be the dominant mechanism rather than pure recombination or thermal excitation mechanism. Both electron dissociation and thermal pyrolysis are able to produce the H radicals as Equations .…”

Section: Resultsmentioning

confidence: 99%

Non‐oxidative methane conversion in diffuse, filamentary, and spark regimes of nanosecond repetitively pulsed discharge with negative polarity

Sun

Shuai

Gao

et al. 2019

Plasma Processes & Polymers

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Methane conversion for higher hydrocarbons was carried out in the diffuse, filamentary, and spark regimes of nanosecond repetitively pulsed discharge with negative polarity in a pin‐to‐plate reactor. The diffuse discharge was characterized as a regime with low‐plasma energy, and only trace hydrogen and C2H6 were found in this regime. In filamentary regime, the conversion rate reached 2.2–7.6% with energy conversion efficiency (ECE) of 8.8–12.7%. Meanwhile the selectivity of C2H6, C2H4, C2H2, and C3 were 24.3–18.6%, 9.3–7%, 5.6–7.3%, and 0–5%, respectively. As for the spark regime, C2H2 became the main hydrocarbon product with the selectivity of 12.8%, conversion rate of 44.7–74.4% and ECE of 12.3%. Electrical measurements and ICCD photographs showed that the short pulse could prevent the streamer turning into spark discharge, and thus realize smooth transitions among each regime. Optical emission spectroscopy was used to investigate the plasma chemistry in each regime. It found that the highest spectral line, gas temperature, and electron density varied in these regimes. These results suggested that, comparing with electron impact reactions, the thermal chemistry became more and more important as the plasma energy increased.

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Section: Resultsmentioning

confidence: 99%