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dc.contributor.CRUESPUNIVERSIDADE ESTADUAL DE CAMPINASpt_BR
dc.contributor.authorunicampRidenti, Marco Antoniopt_BR
dc.contributor.authorunicampAmorim Filho, Jayr dept_BR
dc.typeArtigopt_BR
dc.titleEquilibrium and nonequilibrium features in a warm He+H2O microwave plasma at atmospheric pressurept_BR
dc.contributor.authorRidenti, M. A.pt_BR
dc.contributor.authorAmorim, J. dept_BR
dc.contributor.authorDal Pino Jr., A.pt_BR
dc.subjectPressão atmosféricapt_BR
dc.subjectIonizaçãopt_BR
dc.subjectDiagnóstico de plasmapt_BR
dc.subject.otherlanguageAtmospheric pressurept_BR
dc.subject.otherlanguageIonizationpt_BR
dc.subject.otherlanguagePlasma diagnosticspt_BR
dc.description.abstractA 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.en
dc.description.abstractA 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.pt_BR
dc.relation.ispartofIEEE transactions on plasma sciencept_BR
dc.relation.ispartofabbreviationIEEE trans. plasma sci.pt_BR
dc.publisher.cityPiscataway, NJpt_BR
dc.publisher.countryEstados Unidospt_BR
dc.publisherInstitute of Electrical and Electronics Engineerspt_BR
dc.date.issued2015pt_BR
dc.date.monthofcirculationDec.pt_BR
dc.identifier.citationEquilibrium 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.pt_BR
dc.language.isoengpt_BR
dc.description.volume43pt_BR
dc.description.issuenumber12pt_BR
dc.description.issuepart2pt_BR
dc.description.firstpage4066pt_BR
dc.description.lastpage4076pt_BR
dc.rightsfechadopt_BR
dc.sourceWOSpt_BR
dc.identifier.issn0093-3813pt_BR
dc.identifier.eissn1939-9375pt_BR
dc.identifier.doi10.1109/TPS.2015.2496870pt_BR
dc.identifier.urlhttps://ieeexplore.ieee.org/document/7337424pt_BR
dc.description.sponsorshipCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORpt_BR
dc.description.sponsorship1CAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIORpt_BR
dc.description.sponsordocumentnumberCAPES [CAPES/ITA 005/2014]pt
dc.description.sponsordocumentnumber005/2014pt_BR
dc.date.available2016-06-07T13:35:32Z-
dc.date.accessioned2016-06-07T13:35:32Z-
dc.description.provenanceMade available in DSpace on 2016-06-07T13:35:32Z (GMT). No. of bitstreams: 1 wos_000366470500001.pdf: 1757606 bytes, checksum: 6ae448cf4377817380a1eb2491a1a4bb (MD5) Previous issue date: 2015 Bitstreams deleted on 2020-09-02T13:41:19Z: wos_000366470500001.pdf,. Added 1 bitstream(s) on 2020-09-02T13:45:30Z : No. of bitstreams: 1 000366470500001.pdf: 1834363 bytes, checksum: 5e4fd37615172c70345143fec7b3c7ba (MD5)en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/244154-
dc.contributor.departmentDepartamento de Eletrônica Quânticapt_BR
dc.contributor.departmentDepartamento de Eletrônica Quânticapt_BR
dc.contributor.unidadeInstituto de Física Gleb Wataghinpt_BR
dc.contributor.unidadeInstituto de Física Gleb Wataghinpt_BR
dc.subject.keywordAtmospheric-pressure plasmaspt_BR
dc.subject.keywordNon-local thermodynamic equilibrium plasmaspt_BR
dc.subject.keywordOptical emission spectroscopypt_BR
dc.subject.keywordPhotoexcitation by accidental resonancept_BR
dc.identifier.source000366470500001pt_BR
dc.creator.orcid0000-0001-6483-5128pt_BR
dc.creator.orcid0000-0002-9250-4681pt_BR
dc.type.formArtigopt_BR
dc.description.sponsorNoteThis work was supported by the National Council for the Improvement of Higher Education through the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior under Grant CAPES/ITA 005/2014.pt_BR
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