The effect of collisional quenching of the O 3p 3PJ state on the determination of the spatial distribution of the atomic oxygen density in an APPJ operating in ambient air by TALIF

S. Zhang, A. F.H. Van Gessel, S. C. Van Grootel, P. J. Bruggeman

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Abstract

The spatial profile of the absolute atomic oxygen density is obtained by two-photon absorption laser-induced fluorescence (TALIF) in an Ar+2% air cold atmospheric pressure plasma jet (APPJ) operating in ambient air. The varying air concentration in the jet effluent which contributes to the collisional quenching of the O 3p 3PJ state, pumped by the laser, strongly influences the recorded TALIF signal under the present experimental conditions. The spatially resolved air densities obtained from Raman scattering measurements have been reported in our previous work (van Gessel et al 2013 Appl. Phys. Lett. 103 064103). These densities allow us to calculate the spatially dependent collisional quenching rate for the O 3p 3PJ state and reconstruct the spatial O density profile from the recorded TALIF signal. Significant differences between the TALIF intensity profile and the actual O density profile for the investigated experimental conditions are found.

Original languageEnglish (US)
Article number025012
JournalPlasma Sources Science and Technology
Volume23
Issue number2
DOIs
StatePublished - Apr 2014

Keywords

  • TALIF
  • atomic density
  • collisional quenching

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