Generation of atomic oxygen in the effluent of an atmospheric pressure plasma jet

The planar 13.56 MHz RF-excited low temperature atmospheric pressure plasma jet (APPJ) investigated in this study is operated with helium feed gas and a small molecular oxygen admixture. The effluent leaving the discharge through the jet's nozzle contains very few charged particles and a high r...

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Bibliographic Details
Published inPlasma sources science & technology Vol. 18; no. 1; pp. 015006 - 015006 (9)
Main Authors Reuter, S, Niemi, K, Schulz-von der Gathen, V, Döbele, H F
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.02.2009
Institute of Physics
Subjects
Exact sciences and technology
Optical (ultraviolet, visible, infrared) measurements
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma diagnostic techniques and instrumentation
Oxygen
Emission spectroscopy
Ground states
Atmospheric pressure
Laser induced fluorescence
Helium
Plasma jets
Plasma diagnostics
Optical method
Nozzles
Two photon absorption
Charged particles
Extreme ultraviolet radiation
Energy transfer
Low temperature
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Summary:The planar 13.56 MHz RF-excited low temperature atmospheric pressure plasma jet (APPJ) investigated in this study is operated with helium feed gas and a small molecular oxygen admixture. The effluent leaving the discharge through the jet's nozzle contains very few charged particles and a high reactive oxygen species' density. As its main reactive radical, essential for numerous applications, the ground state atomic oxygen density in the APPJ's effluent is measured spatially resolved with two-photon absorption laser induced fluorescence spectroscopy. The atomic oxygen density at the nozzle reaches a value of ~1016 cm-3. Even at several centimetres distance still 1% of this initial atomic oxygen density can be detected. Optical emission spectroscopy (OES) reveals the presence of short living excited oxygen atoms up to 10 cm distance from the jet's nozzle. The measured high ground state atomic oxygen density and the unaccounted for presence of excited atomic oxygen require further investigations on a possible energy transfer from the APPJ's discharge region into the effluent: energetic vacuum ultraviolet radiation, measured by OES down to 110 nm, reaches far into the effluent where it is presumed to be responsible for the generation of atomic oxygen.*
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0963-0252
1361-6595
DOI:10.1088/0963-0252/18/1/015006