Modelling current transfer to cathodes in metal halide plasmas
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.13/4793 |
Resumo: | This work is concerned with investigation of the main features of current transfer to cathodes under conditions characteristic of metal halide (MH) lamps. It is found that the presence of MHs in the gas phase results in a small decrease of the cathode surface temperature and of the near-cathode voltage drop in the diffuse mode of current transfer; the range of stability of the diffuse mode expands. Effects caused by a variation of the work function of the cathode surface owing to formation of a monolayer of alkali metal atoms on the surface are studied for particular cases where the monolayer is composed of sodium or caesium. It is found that the formation of the sodium monolayer affects the diffuse mode of current transfer only moderately and in the same direction that the presence of metal atoms in the gas phase affects it. Formation of the caesium monolayer produces a dramatic effect: the cathode surface temperature decreases very strongly, the diffuse-mode current–voltage characteristic becomes N–S-shaped. |
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Modelling current transfer to cathodes in metal halide plasmasCurrent transfer to cathodesMetal halide plasmas.Faculdade de Ciências Exatas e da EngenhariaThis work is concerned with investigation of the main features of current transfer to cathodes under conditions characteristic of metal halide (MH) lamps. It is found that the presence of MHs in the gas phase results in a small decrease of the cathode surface temperature and of the near-cathode voltage drop in the diffuse mode of current transfer; the range of stability of the diffuse mode expands. Effects caused by a variation of the work function of the cathode surface owing to formation of a monolayer of alkali metal atoms on the surface are studied for particular cases where the monolayer is composed of sodium or caesium. It is found that the formation of the sodium monolayer affects the diffuse mode of current transfer only moderately and in the same direction that the presence of metal atoms in the gas phase affects it. Formation of the caesium monolayer produces a dramatic effect: the cathode surface temperature decreases very strongly, the diffuse-mode current–voltage characteristic becomes N–S-shaped.IOP PublishingDigitUMaBenilov, M. S.Cunha, M DNaidis, G. V.2022-11-21T12:16:16Z20052005-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/4793engBenilov, M. S., Cunha, M. D., & Naidis, G. V. (2005). Modelling current transfer to cathodes in metal halide plasmas. Journal of Physics D: Applied Physics, 38(17), 3155-3162.10.1088/0022-3727/38/17/S16info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-04-02T05:44:21Zoai:digituma.uma.pt:10400.13/4793Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:14:56.139782Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Modelling current transfer to cathodes in metal halide plasmas |
title |
Modelling current transfer to cathodes in metal halide plasmas |
spellingShingle |
Modelling current transfer to cathodes in metal halide plasmas Benilov, M. S. Current transfer to cathodes Metal halide plasmas . Faculdade de Ciências Exatas e da Engenharia |
title_short |
Modelling current transfer to cathodes in metal halide plasmas |
title_full |
Modelling current transfer to cathodes in metal halide plasmas |
title_fullStr |
Modelling current transfer to cathodes in metal halide plasmas |
title_full_unstemmed |
Modelling current transfer to cathodes in metal halide plasmas |
title_sort |
Modelling current transfer to cathodes in metal halide plasmas |
author |
Benilov, M. S. |
author_facet |
Benilov, M. S. Cunha, M D Naidis, G. V. |
author_role |
author |
author2 |
Cunha, M D Naidis, G. V. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
DigitUMa |
dc.contributor.author.fl_str_mv |
Benilov, M. S. Cunha, M D Naidis, G. V. |
dc.subject.por.fl_str_mv |
Current transfer to cathodes Metal halide plasmas . Faculdade de Ciências Exatas e da Engenharia |
topic |
Current transfer to cathodes Metal halide plasmas . Faculdade de Ciências Exatas e da Engenharia |
description |
This work is concerned with investigation of the main features of current transfer to cathodes under conditions characteristic of metal halide (MH) lamps. It is found that the presence of MHs in the gas phase results in a small decrease of the cathode surface temperature and of the near-cathode voltage drop in the diffuse mode of current transfer; the range of stability of the diffuse mode expands. Effects caused by a variation of the work function of the cathode surface owing to formation of a monolayer of alkali metal atoms on the surface are studied for particular cases where the monolayer is composed of sodium or caesium. It is found that the formation of the sodium monolayer affects the diffuse mode of current transfer only moderately and in the same direction that the presence of metal atoms in the gas phase affects it. Formation of the caesium monolayer produces a dramatic effect: the cathode surface temperature decreases very strongly, the diffuse-mode current–voltage characteristic becomes N–S-shaped. |
publishDate |
2005 |
dc.date.none.fl_str_mv |
2005 2005-01-01T00:00:00Z 2022-11-21T12:16:16Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.13/4793 |
url |
http://hdl.handle.net/10400.13/4793 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Benilov, M. S., Cunha, M. D., & Naidis, G. V. (2005). Modelling current transfer to cathodes in metal halide plasmas. Journal of Physics D: Applied Physics, 38(17), 3155-3162. 10.1088/0022-3727/38/17/S16 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
IOP Publishing |
publisher.none.fl_str_mv |
IOP Publishing |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799130603550932992 |