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Corona discharge experiments in admixtures of N2 and CH4: a laboratory simulation of Titan's atmosphere

Horvath, G.; Skalny, J. D.; Mason, N. J.; Klas, M.; Zahoran, M.; Vladoiu, R. and Manole, M. (2009). Corona discharge experiments in admixtures of N2 and CH4: a laboratory simulation of Titan's atmosphere. Plasma Sources Science and Technology, 18(3)

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A positive corona discharge fed by a N2:CH4 mixture (98:2) at atmospheric pressure and ambient temperature has been studied as a laboratory mimic of the chemical processes occurring in the atmosphere of Titan, Saturn's largest moon. In-situ measurements of UV and IR transmission spectra within the discharge have shown that the main chemical product is C2H2, produced by dissociation of CH4, with small but significant traces of ethane and HCN, all species that have been detected in Titan's atmosphere. A small amount (0.2 %) CH4 was decomposed after 12 minutes of treatment requiring an average energy of 2.7 kWh/g. After 14 minutes the discharge was terminated due to the formation of a solid yellow deposit on the central wire electrode. Such a deposit is similar to that observed in other discharges and is believed to be an analogue of the aerosol and dust observed in Titan's atmosphere and is composed of chemcial species commonly knonw as 'tholins'. We have also explored the electrical properties of the discharge. The admixture of methane into nitrogen caused an increase in onset voltage of the discharge and consequently led to a reduction in the measured discharge current.

Item Type: Journal Item
Copyright Holders: 2009 IOP Publishing Ltd
ISSN: 1361-6595
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Physics
Item ID: 17771
Depositing User: Users 9108 not found.
Date Deposited: 16 Jul 2009 09:42
Last Modified: 16 Jun 2020 07:48
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