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Title: Density and production of NH and NH{sub 2} in an Ar-NH{sub 3} expanding plasma jet

Abstract

The densities of NH and NH{sub 2} radicals in an Ar-NH{sub 3} plasma jet created by the expanding thermal plasma source were investigated for various source-operating conditions such as plasma current and NH{sub 3} flow. The radicals were measured by cavity ringdown absorption spectroscopy using the (0,0) band of the A {sup 3}{pi}<-X {sup 3}{sigma}{sup -} transition for NH and the (0,9,0)-(0,0,0) band of the A-tilde{sup 2}A{sub 1}<-X-tilde{sup 2}B{sub 1} transition for NH{sub 2}. For NH, a kinetic gas temperature and rotational temperature of 1750{+-}100 and 1920{+-}100 K were found, respectively. The measurements revealed typical densities of 2.5x10{sup 12} cm{sup -3} for the NH radical and 3.5x10{sup 12} cm{sup -3} for the NH{sub 2} radical. From the combination of the data with ion density and NH{sub 3} consumption measurements in the plasma as well as from a simple one-dimensional plug down model, the key production reactions for NH and NH{sub 2} are discussed.

Authors:
; ; ; ; ; ;  [1]
  1. Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven (Netherlands)
Publication Date:
OSTI Identifier:
20719649
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 98; Journal Issue: 9; Other Information: DOI: 10.1063/1.2123371; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION SPECTROSCOPY; AMMONIA; ARGON; DISSOCIATION; ION DENSITY; ONE-DIMENSIONAL CALCULATIONS; PLASMA; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA JETS; RADICALS

Citation Formats

Oever, P.J. van den, Helden, J.H. van, Lamers, C.C.H., Engeln, R., Schram, D.C., Sanden, M.C.M. van de, and Kessels, W.M.M. Density and production of NH and NH{sub 2} in an Ar-NH{sub 3} expanding plasma jet. United States: N. p., 2005. Web. doi:10.1063/1.2123371.
Oever, P.J. van den, Helden, J.H. van, Lamers, C.C.H., Engeln, R., Schram, D.C., Sanden, M.C.M. van de, & Kessels, W.M.M. Density and production of NH and NH{sub 2} in an Ar-NH{sub 3} expanding plasma jet. United States. doi:10.1063/1.2123371.
Oever, P.J. van den, Helden, J.H. van, Lamers, C.C.H., Engeln, R., Schram, D.C., Sanden, M.C.M. van de, and Kessels, W.M.M. Tue . "Density and production of NH and NH{sub 2} in an Ar-NH{sub 3} expanding plasma jet". United States. doi:10.1063/1.2123371.
@article{osti_20719649,
title = {Density and production of NH and NH{sub 2} in an Ar-NH{sub 3} expanding plasma jet},
author = {Oever, P.J. van den and Helden, J.H. van and Lamers, C.C.H. and Engeln, R. and Schram, D.C. and Sanden, M.C.M. van de and Kessels, W.M.M.},
abstractNote = {The densities of NH and NH{sub 2} radicals in an Ar-NH{sub 3} plasma jet created by the expanding thermal plasma source were investigated for various source-operating conditions such as plasma current and NH{sub 3} flow. The radicals were measured by cavity ringdown absorption spectroscopy using the (0,0) band of the A {sup 3}{pi}<-X {sup 3}{sigma}{sup -} transition for NH and the (0,9,0)-(0,0,0) band of the A-tilde{sup 2}A{sub 1}<-X-tilde{sup 2}B{sub 1} transition for NH{sub 2}. For NH, a kinetic gas temperature and rotational temperature of 1750{+-}100 and 1920{+-}100 K were found, respectively. The measurements revealed typical densities of 2.5x10{sup 12} cm{sup -3} for the NH radical and 3.5x10{sup 12} cm{sup -3} for the NH{sub 2} radical. From the combination of the data with ion density and NH{sub 3} consumption measurements in the plasma as well as from a simple one-dimensional plug down model, the key production reactions for NH and NH{sub 2} are discussed.},
doi = {10.1063/1.2123371},
journal = {Journal of Applied Physics},
number = 9,
volume = 98,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}