Diagnostics and modeling of cold plasmas with high hydrogen content

The study of cold plasmas with high hydrogen content is relevant in a wide variety of fields. The characterization of the different species in these plasmas and their interaction with surfaces has technological applications, such as thin film growth and materials processing. The ions present in this...

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Detalles Bibliográficos
Autor: Jiménez Redondo, Miguel
Tipo de recurso: tesis doctoral
Fecha de publicación:2017
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/22442
Acceso en línea:https://hdl.handle.net/20.500.14352/22442
Access Level:acceso abierto
Palabra clave:533.9(043.2)
Plasma
Física nuclear
2207 Física Atómica y Nuclear
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spelling Diagnostics and modeling of cold plasmas with high hydrogen contentDiagnóstico y modelado de plasmas fríos con alto contenido en hidrógenoJiménez Redondo, Miguel533.9(043.2)PlasmaFísica nuclear2207 Física Atómica y NuclearThe study of cold plasmas with high hydrogen content is relevant in a wide variety of fields. The characterization of the different species in these plasmas and their interaction with surfaces has technological applications, such as thin film growth and materials processing. The ions present in this type of plasmas play an important role in molecule formation in the interstellar medium. In this work, a study of the neutral and ionic species present in plasmas of H2 + Ar,H2 + N2, and H2 + O2 generated in hollow cathode discharges is presented. Experimentaldiagnostics in combination with kinetic modeling have been employed in order to determine the main processes behind the physics and chemistry of each of the different mixtures. The hollow cathode reactor used in the experiments consists of a grounded stainless steel cylinder with a central anode. A voltage of hundreds of volts is applied to the anode, generating a current of tenths of an ampere. A steady flow of mixtures of H2 + Ar, H2 + N2,and H2 + O2 with different mixture ratios at low pressures (~ Pa) is employed as precursor. The neutral species in the plasma are analyzed with a quadrupole mass spectrometer, while positive ions are sampled using a plasma monitor that allows themeasurement of their energy distributions. The electron temperature and density of theplasma are determined using a double Langmuir probe. Vibrational and rotational gas temperatures are obtained by optical emission spectroscopy. A kinetic model accounting for the main physico-chemical processes occurring in the discharge is employed in order to simulate the abundances of the different species. Thecomparison with the experimental results allows the determination of the fundamental mechanisms behind the chemistry of the different mixtures. The main processes considered are electron impact dissociation and ionization, ion-molecule reactions, and heterogeneous reactions occurring at the reactor walls...Universidad Complutense de MadridTanarro Onrubia, IsabelUniversidad Complutense de Madrid20172017-08-0220172017-08-02doctoral thesishttp://purl.org/coar/resource_type/c_db06info:eu-repo/semantics/doctoralThesisapplication/pdfhttps://hdl.handle.net/20.500.14352/22442reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/224422026-06-02T12:44:21Z
dc.title.none.fl_str_mv Diagnostics and modeling of cold plasmas with high hydrogen content
Diagnóstico y modelado de plasmas fríos con alto contenido en hidrógeno
title Diagnostics and modeling of cold plasmas with high hydrogen content
spellingShingle Diagnostics and modeling of cold plasmas with high hydrogen content
Jiménez Redondo, Miguel
533.9(043.2)
Plasma
Física nuclear
2207 Física Atómica y Nuclear
title_short Diagnostics and modeling of cold plasmas with high hydrogen content
title_full Diagnostics and modeling of cold plasmas with high hydrogen content
title_fullStr Diagnostics and modeling of cold plasmas with high hydrogen content
title_full_unstemmed Diagnostics and modeling of cold plasmas with high hydrogen content
title_sort Diagnostics and modeling of cold plasmas with high hydrogen content
dc.creator.none.fl_str_mv Jiménez Redondo, Miguel
author Jiménez Redondo, Miguel
author_facet Jiménez Redondo, Miguel
author_role author
dc.contributor.none.fl_str_mv Tanarro Onrubia, Isabel
Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 533.9(043.2)
Plasma
Física nuclear
2207 Física Atómica y Nuclear
topic 533.9(043.2)
Plasma
Física nuclear
2207 Física Atómica y Nuclear
description The study of cold plasmas with high hydrogen content is relevant in a wide variety of fields. The characterization of the different species in these plasmas and their interaction with surfaces has technological applications, such as thin film growth and materials processing. The ions present in this type of plasmas play an important role in molecule formation in the interstellar medium. In this work, a study of the neutral and ionic species present in plasmas of H2 + Ar,H2 + N2, and H2 + O2 generated in hollow cathode discharges is presented. Experimentaldiagnostics in combination with kinetic modeling have been employed in order to determine the main processes behind the physics and chemistry of each of the different mixtures. The hollow cathode reactor used in the experiments consists of a grounded stainless steel cylinder with a central anode. A voltage of hundreds of volts is applied to the anode, generating a current of tenths of an ampere. A steady flow of mixtures of H2 + Ar, H2 + N2,and H2 + O2 with different mixture ratios at low pressures (~ Pa) is employed as precursor. The neutral species in the plasma are analyzed with a quadrupole mass spectrometer, while positive ions are sampled using a plasma monitor that allows themeasurement of their energy distributions. The electron temperature and density of theplasma are determined using a double Langmuir probe. Vibrational and rotational gas temperatures are obtained by optical emission spectroscopy. A kinetic model accounting for the main physico-chemical processes occurring in the discharge is employed in order to simulate the abundances of the different species. Thecomparison with the experimental results allows the determination of the fundamental mechanisms behind the chemistry of the different mixtures. The main processes considered are electron impact dissociation and ionization, ion-molecule reactions, and heterogeneous reactions occurring at the reactor walls...
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-08-02
2017
2017-08-02
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/22442
url https://hdl.handle.net/20.500.14352/22442
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Complutense de Madrid
publisher.none.fl_str_mv Universidad Complutense de Madrid
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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