Microwave air plasma source at atmospheric pressure: Experiment and theory

An experimental and theoretical investigation of the axial structure of a surface wave (2.45 GHz) driven atmospheric plasma source in air with a small admixture (1%) of water vapor has been performed. Measurements of the gas temperature and of the intensities of the O(777.4 nm), O(844.6 nm), and O(6...

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Bibliographic Details
Published in:Journal of applied physics 2010-12, Vol.108 (12), p.123305-123305-18
Main Authors: Tatarova, E., Dias, F. M., Felizardo, E., Henriques, J., Pinheiro, M. J., Ferreira, C. M., Gordiets, B.
Format: Article
Language:English
Subjects:
AMPLITUDES
ATMOSPHERIC PRESSURE
ATOMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPARATIVE EVALUATIONS
DISPERSIONS
ELECTRODYNAMICS
ELECTROMAGNETIC RADIATION
ELECTRON TEMPERATURE
ELEMENTS
EMISSION
ENERGY
EVALUATION
FLUIDS
FREQUENCY RANGE
GASES
GHZ RANGE
ION TEMPERATURE
KINETIC ENERGY
MICROWAVE RADIATION
NONMETALS
OXYGEN
PLASMA
PLASMA DIAGNOSTICS
RADIATIONS
VAPORS
WATER VAPOR
WAVE PROPAGATION
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Summary:An experimental and theoretical investigation of the axial structure of a surface wave (2.45 GHz) driven atmospheric plasma source in air with a small admixture (1%) of water vapor has been performed. Measurements of the gas temperature and of the intensities of the O(777.4 nm), O(844.6 nm), and O(630 nm) atomic lines and the NO ( γ ) molecular band versus input power and axial position were carried out. Amplitude and phase sensitive measurements have also been performed to derive the surface wave dispersion characteristics. The experimental results are analyzed in terms of a one-dimensional theoretical model based on a self-consistent treatment of particle kinetics, gas dynamics, and wave electrodynamics. The predicted gas temperature and emission line intensities variations with power and axial position are shown to compare well with experiment. "Hot" excited O atoms (with kinetic energy ∼ 2   eV ) have been detected.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3525245