Time dependent optical emission spectroscopy of sub-microsecond pulsed plasmas in air with water cathode

Peter Bruggeman, James L. Walsh, Daan C. Schram, Christophe Leys, Michael G. Kong

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

This paper reports an experimental study of sub-microsecond pulsed discharges between a metal pin electrode and a tap water cathode in atmospheric pressure air. The dynamics of excited molecular and atomic species produced in the discharge is investigated by time resolved optical emission spectroscopy. The initial diffuse plasma constricts around 300 ns after the start of the voltage pulse. This constriction is correlated with an increase in gas temperature from 1000 to 5000 K and a strong increase in emission from O (777 nm), Hα and NH(A-X). The formation of OH(A-X) is discussed in the framework of OH (and thus H2O2 production) in plasmas in and in contact with liquids. It is argued that electron dissociative recombination of the water ion plays an important role in the production of OH(A) and that the relative intensity of the OH(A) emission may not provide a good estimate of the OH concentration without correction for electronic quenching of OH(A).

Original languageEnglish (US)
Article number045023
JournalPlasma Sources Science and Technology
Volume18
Issue number4
DOIs
StatePublished - Nov 9 2009

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optical emission spectroscopy
cathodes
electron recombination
air
taps
gas temperature
water
constrictions
atmospheric pressure
quenching
electrodes
electric potential
estimates
liquids
pulses
electronics
metals
ions

Cite this

Time dependent optical emission spectroscopy of sub-microsecond pulsed plasmas in air with water cathode. / Bruggeman, Peter; Walsh, James L.; Schram, Daan C.; Leys, Christophe; Kong, Michael G.

In: Plasma Sources Science and Technology, Vol. 18, No. 4, 045023, 09.11.2009.

Research output: Contribution to journalArticle

Bruggeman, Peter ; Walsh, James L. ; Schram, Daan C. ; Leys, Christophe ; Kong, Michael G. / Time dependent optical emission spectroscopy of sub-microsecond pulsed plasmas in air with water cathode. In: Plasma Sources Science and Technology. 2009 ; Vol. 18, No. 4.
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