OH density measurements in nanosecond pulsed discharges in atmospheric pressure N2-H2O mixtures

T. Verreycken, P. J. Bruggeman

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22 Scopus citations

Abstract

Time and spatially resolved OH densities are determined in a nanosecond pulsed filamentary discharge in N2-H2O for varying water concentration using laser-induced fluorescence (LIF). The OH densities are absolutely calibrated using Rayleigh scattering. A dip in the LIF signal is found at the centre of the filament. In the case of 2.6% H2O a remarkable increase in OH density is found in the far afterglow and is discussed in analogy with the pink splash or pink afterglow. It is believed that the large amount of energy released in the recombination of atomic nitrogen plays an important role in the production of OH in the far afterglow.

Original languageEnglish (US)
Article number015009
JournalPlasma Sources Science and Technology
Volume23
Issue number1
DOIs
StatePublished - Feb 1 2014
Externally publishedYes

Keywords

  • OH dynamics
  • atmospheric pressure plasma
  • laser induced fluorescence
  • nanosecond pulsed discharges

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