The European Physical Journal D

, 66:281

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

  • Q. Xiong
  • A. Yu. Nikiforov
  • L. Li
  • P. Vanraes
  • N. Britun
  • R. Snyders
  • X. P. Lu
  • C. Leys
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

Authors and Affiliations

  • Q. Xiong
    • 1
    • 2
  • A. Yu. Nikiforov
    • 2
    • 3
  • L. Li
    • 2
  • P. Vanraes
    • 2
  • N. Britun
    • 4
  • R. Snyders
    • 4
    • 5
  • X. P. Lu
    • 1
  • C. Leys
    • 2
  1. 1.HuaZhong University of Science and TechnologyCollege of Electrical and Electronic EngineeringHubeiP.R. China
  2. 2.Department of Applied Physics, Research Unit Plasma TechnologyGhent UniversityGhentBelgium
  3. 3.Institute of Solution Chemistry of the Russian Academy of ScienceIvanonoRussia
  4. 4.Université de MonsChimie des Interactions Plasma-Surface (ChIPS), CIRMAPMonsBelgium
  5. 5.Materia Nova Research Center, Parc InitialisMonsBelgium