Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/244154
Type: Artigo de periódico
Title: Equilibrium And Nonequilibrium Features In A Warm He+h2o Microwave Plasma At Atmospheric Pressure
Author: Ridenti
Marco A.; de Amorim
Jayr; Dal Pino
Arnaldo
Jr.
Abstract: A microwave surface-wave discharge at atmospheric pressure was generated using a He/H2O mixture and studied by optical emission spectroscopy. The main plasma parameters were determined based on the analysis of the spectra when partial thermodynamic equilibrium could be verified. The analysis showed that the system can be classified as a warm plasma with an average gas temperature of 1.7 x 10(3) K, an axially averaged electron density of 2.4 x 10(13) cm(-3), and a semiempirically estimated average electron temperature of 15 x 10(3) K. The experimental evidence and theoretical arguments suggest that the main source of ionization in this plasma is the electronic impact ionization of water molecules. An abnormal intensity in the O I [ 3p(3)P0,1,2] -> [ 3s(3)S(1)degrees] transition was observed, revealing an overpopulation of the 3p(3)P(0,1,2) states. This observation-which may be explored to obtain stimulated emission-was explained as an effect of the reabsorption of photons generated in the plasma by the H I Ly beta emission by oxygen atoms ( O (IP2)-P-3 -> 3d(3)D(1,2,3)degrees transition), an effect generally known as photoexcitation by accidental resonance.
Subject: Radiative Model
Helium
Argon
Temperature
Hydrogen
Country: PISCATAWAY
Editor: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation: Equilibrium And Nonequilibrium Features In A Warm He+h2o Microwave Plasma At Atmospheric Pressure. Ieee-inst Electrical Electronics Engineers Inc, v. 43, p. 4066-4076 DEC-2015.
Rights: fechado
Identifier DOI: 10.1109/TPS.2015.2496870
Address: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7337424
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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