Experimental study of surface contributions to molecule formation in a recombining N2/O2 plasma

R.A.B. Zijlmans, S. Welzel, O.G. Gabriel, G. Yagci, J.H. Helden, van, J. Röpcke, D.C. Schram, R.A.H. Engeln

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Uittreksel

A low pressure recombining Ar plasma to which mixtures of N2 and O2 were added has been studied to explore the relevance of surface related processes for the total chemistry. The abundances of the stable molecules N2, O2, NO, N2O and NO2 have been measured by means of a combination of infrared tunable diode laser absorption spectroscopy and mass spectrometry. A gas phase chemical kinetics model was developed in CHEMKIN to investigate the contribution of homogeneous interactions to the conversion of the feedstock gases N2 and O2. At a partial pressure of N2 plus O2 less than 8 Pa, significant discrepancies between measured and calculated concentrations of N2O and NO2 were observed, indicating that heterogeneous processes are dominating the chemistry in this pressure range. At a partial pressure of N2 plus O2 higher than 40 Pa and a relatively high fraction of admixed O2 we observed a fair agreement between measured and calculated concentrations of NO molecules, indicating that homogeneous processes (notably N atom induced) are more dominant than heterogeneous processes.
Originele taal-2Engels
Artikelnummer115204
Pagina's (van-tot)115204-1/9
Aantal pagina's9
TijdschriftJournal of Physics D: Applied Physics
Volume43
Nummer van het tijdschrift11
DOI's
StatusGepubliceerd - 2010

Vingerafdruk

Partial pressure
partial pressure
Gases
chemistry
Plasmas
Molecules
Laser spectroscopy
laser spectroscopy
Absorption spectroscopy
Reaction kinetics
Feedstocks
Mass spectrometry
Semiconductor lasers
molecules
absorption spectroscopy
reaction kinetics
mass spectroscopy
low pressure
diodes
vapor phases

Citeer dit

Zijlmans, R.A.B. ; Welzel, S. ; Gabriel, O.G. ; Yagci, G. ; Helden, van, J.H. ; Röpcke, J. ; Schram, D.C. ; Engeln, R.A.H. / Experimental study of surface contributions to molecule formation in a recombining N2/O2 plasma. In: Journal of Physics D: Applied Physics. 2010 ; Vol. 43, Nr. 11. blz. 115204-1/9.
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abstract = "A low pressure recombining Ar plasma to which mixtures of N2 and O2 were added has been studied to explore the relevance of surface related processes for the total chemistry. The abundances of the stable molecules N2, O2, NO, N2O and NO2 have been measured by means of a combination of infrared tunable diode laser absorption spectroscopy and mass spectrometry. A gas phase chemical kinetics model was developed in CHEMKIN to investigate the contribution of homogeneous interactions to the conversion of the feedstock gases N2 and O2. At a partial pressure of N2 plus O2 less than 8 Pa, significant discrepancies between measured and calculated concentrations of N2O and NO2 were observed, indicating that heterogeneous processes are dominating the chemistry in this pressure range. At a partial pressure of N2 plus O2 higher than 40 Pa and a relatively high fraction of admixed O2 we observed a fair agreement between measured and calculated concentrations of NO molecules, indicating that homogeneous processes (notably N atom induced) are more dominant than heterogeneous processes.",
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Experimental study of surface contributions to molecule formation in a recombining N2/O2 plasma. / Zijlmans, R.A.B.; Welzel, S.; Gabriel, O.G.; Yagci, G.; Helden, van, J.H.; Röpcke, J.; Schram, D.C.; Engeln, R.A.H.

In: Journal of Physics D: Applied Physics, Vol. 43, Nr. 11, 115204, 2010, blz. 115204-1/9.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Experimental study of surface contributions to molecule formation in a recombining N2/O2 plasma

AU - Zijlmans, R.A.B.

AU - Welzel, S.

AU - Gabriel, O.G.

AU - Yagci, G.

AU - Helden, van, J.H.

AU - Röpcke, J.

AU - Schram, D.C.

AU - Engeln, R.A.H.

PY - 2010

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N2 - A low pressure recombining Ar plasma to which mixtures of N2 and O2 were added has been studied to explore the relevance of surface related processes for the total chemistry. The abundances of the stable molecules N2, O2, NO, N2O and NO2 have been measured by means of a combination of infrared tunable diode laser absorption spectroscopy and mass spectrometry. A gas phase chemical kinetics model was developed in CHEMKIN to investigate the contribution of homogeneous interactions to the conversion of the feedstock gases N2 and O2. At a partial pressure of N2 plus O2 less than 8 Pa, significant discrepancies between measured and calculated concentrations of N2O and NO2 were observed, indicating that heterogeneous processes are dominating the chemistry in this pressure range. At a partial pressure of N2 plus O2 higher than 40 Pa and a relatively high fraction of admixed O2 we observed a fair agreement between measured and calculated concentrations of NO molecules, indicating that homogeneous processes (notably N atom induced) are more dominant than heterogeneous processes.

AB - A low pressure recombining Ar plasma to which mixtures of N2 and O2 were added has been studied to explore the relevance of surface related processes for the total chemistry. The abundances of the stable molecules N2, O2, NO, N2O and NO2 have been measured by means of a combination of infrared tunable diode laser absorption spectroscopy and mass spectrometry. A gas phase chemical kinetics model was developed in CHEMKIN to investigate the contribution of homogeneous interactions to the conversion of the feedstock gases N2 and O2. At a partial pressure of N2 plus O2 less than 8 Pa, significant discrepancies between measured and calculated concentrations of N2O and NO2 were observed, indicating that heterogeneous processes are dominating the chemistry in this pressure range. At a partial pressure of N2 plus O2 higher than 40 Pa and a relatively high fraction of admixed O2 we observed a fair agreement between measured and calculated concentrations of NO molecules, indicating that homogeneous processes (notably N atom induced) are more dominant than heterogeneous processes.

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