The European Physical Journal D

, 66:281

Absolute OH density determination by laser induced fluorescence spectroscopy in an atmospheric pressure RF plasma jet

Authors

  • Q. Xiong
    • HuaZhong University of Science and TechnologyCollege of Electrical and Electronic Engineering
    • Department of Applied Physics, Research Unit Plasma TechnologyGhent University
    • Department of Applied Physics, Research Unit Plasma TechnologyGhent University
    • Institute of Solution Chemistry of the Russian Academy of Science
  • L. Li
    • Department of Applied Physics, Research Unit Plasma TechnologyGhent University
  • P. Vanraes
    • Department of Applied Physics, Research Unit Plasma TechnologyGhent University
  • N. Britun
    • Université de MonsChimie des Interactions Plasma-Surface (ChIPS), CIRMAP
  • R. Snyders
    • Université de MonsChimie des Interactions Plasma-Surface (ChIPS), CIRMAP
    • Materia Nova Research Center, Parc Initialis
  • X. P. Lu
    • HuaZhong University of Science and TechnologyCollege of Electrical and Electronic Engineering
  • C. Leys
    • Department of Applied Physics, Research Unit Plasma TechnologyGhent University
Regular Article

DOI: 10.1140/epjd/e2012-30474-8

Cite this article as:
Xiong, Q., Nikiforov, A.Y., Li, L. et al. Eur. Phys. J. D (2012) 66: 281. doi:10.1140/epjd/e2012-30474-8

Abstract

In this paper, the ground state OH density is measured in high pressure plasma by laser-induced fluorescence (LIF) spectroscopy. The OH density determination is based on the simulation of the intensity fraction of fluorescence from the laser-excited level of OH (A) in the total detected LIF signal. The validity of this approach is verified in an atmospheric pressure Ar  +  H2O plasma jet sustained by a 13.56 MHz power supply. The transition line P1 (4) from OH (A,v′ = 1,J′ = 3) → OH   (X,v′′ = 0,J′′ = 4) is used for the LIF excitation. The absolute OH density is determined to be 2.5 × 1019 m-3 at 1 mm away from the jet nozzle. It corresponds to a dissociation of 0.06% of the water vapor in the working gas. Different mechanisms of OH (X) production in the core of the plasma jet are discussed and analyzed.

Keywords

Plasma Physics

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012