Microwave plasma source operating with atmospheric pressure air-water mixtures

The overall performance of a surface wave driven air-water plasma source operating at atmospheric pressure and 2.45 GHz has been analyzed. A 1D model previously developed has been improved in order to describe in detail the creation and loss processes of active species of interest. This model provid...

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Veröffentlicht in:Journal of applied physics 2012-11, Vol.112 (9)
Hauptverfasser: Tatarova, E., Henriques, J. P., Felizardo, E., Lino da Silva, M., Ferreira, C. M., Gordiets, B.
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container_issue 9
container_start_page
container_title Journal of applied physics
container_volume 112
creator Tatarova, E.
Henriques, J. P.
Felizardo, E.
Lino da Silva, M.
Ferreira, C. M.
Gordiets, B.
description The overall performance of a surface wave driven air-water plasma source operating at atmospheric pressure and 2.45 GHz has been analyzed. A 1D model previously developed has been improved in order to describe in detail the creation and loss processes of active species of interest. This model provides a complete characterization of the axial structure of the source, including the discharge and the afterglow zones. The main electron creation channel was found to be the associative ionization process N + O → NO+ + e. The NO(X) relative density in the afterglow plasma jet ranges from 1.2% to 1.6% depending on power and water percentage, according to the model predictions and the measurements. Other types of species such as NO2 and nitrous acid HNO2 have also been detected by mass and Fourier Transform Infrared spectroscopy. The relative population density of O(3P) ground state atoms increases from 8% to 10% in the discharge zone when the input microwave power increases from 200 to 400 W and the water percentage from 1% to 10%. Furthermore, high densities of O2(a1Δg) singlet delta oxygen molecules and OH radicals (1% and 5%, respectively) can be achieved in the discharge zone. In the late afterglow the O2(a1Δg) density is about 0.1% of the total density. This plasma source has a flexible operation and potential for channeling the energy in ways that maximize the density of active species of interest.
doi_str_mv 10.1063/1.4762015
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source AIP Journals Complete; AIP Digital Archive; Alma/SFX Local Collection
subjects 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AFTERGLOW
AIR
ATMOSPHERIC PRESSURE
FOURIER TRANSFORM SPECTROMETERS
GROUND STATES
HIGH-FREQUENCY DISCHARGES
HYDROXYL RADICALS
IONIZATION
MICROWAVE RADIATION
MIXTURES
NITROGEN DIOXIDE
NITROUS ACID
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA JETS
SIMULATION
WATER
title Microwave plasma source operating with atmospheric pressure air-water mixtures
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