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An experimental test for effective medium approximations (EMAs) Porosity determination for ices of astrophysical interest

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An experimental test for effective medium approximations (EMAs) Porosity determination for ices of astrophysical interest

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dc.contributor.author Millán Verdú, Carlos es_ES
dc.contributor.author Santonja Moltó, Mª Del Carmen es_ES
dc.contributor.author Domingo Beltran, Manuel es_ES
dc.contributor.author Luna Molina, Ramón es_ES
dc.contributor.author Satorre, M. Á. es_ES
dc.date.accessioned 2020-01-22T21:02:40Z
dc.date.available 2020-01-22T21:02:40Z
dc.date.issued 2019 es_ES
dc.identifier.issn 0004-6361 es_ES
dc.identifier.uri http://hdl.handle.net/10251/135416
dc.description.abstract [EN] Aims. The effective medium approximations (EMAs), or the Lorentz-Lorenz, Maxwell-Garnett, and Bruggeman models, largely used to obtain optical properties and porosities of pure and ice mixtures, have been experimentally tested in this work. The efficiency of these approximations has been studied by obtaining the porosity value for carbon dioxide ice grown at low temperatures. An explanation of the behaviour of the experimental results for all temperatures is given. The analysis carried out for CO2 can be applied to other molecules. Methods. An optical laser interference technique was carried out using two laser beams falling on a growing film of ice at different incident angles which allowed us to determine the refractive index and the thickness of the film. The mass deposited is recorded by means of a quartz crystal microbalance. Porosity is determined from its equational definition by using the experimental density previously obtained. Results. From the experimental results of the refractive index and density, porosity values for carbon dioxide ice films grown on a cold surface at different temperatures of deposition have been calculated and compared with the results obtained from the EMA equations, and with recent experimental results. Conclusion. The values of porosity obtained with the EMA models and experimentally, show similar trends. However, theoretical values overestimate the experimental results. We can conclude that using the EMAs to obtain this parameter from an ice mixture must be carefully considered and, if possible, an alternative experimental procedure that allows comparisons to be made should be used. es_ES
dc.description.sponsorship Funds have been provided for this research by the Spanish MINECO, Project FIS2016-77726-C3-3-P. es_ES
dc.language Inglés es_ES
dc.publisher EDP Sciences es_ES
dc.relation AEI/FIS2016-77726-C3-3-P es_ES
dc.relation.ispartof Astronomy and Astrophysics es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject Astrochemistry es_ES
dc.subject Methods: laboratory: solid state es_ES
dc.subject ISM: molecules es_ES
dc.subject.classification FISICA APLICADA es_ES
dc.title An experimental test for effective medium approximations (EMAs) Porosity determination for ices of astrophysical interest es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1051/0004-6361/201935153 es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada es_ES
dc.description.bibliographicCitation Millán Verdú, C.; Santonja Moltó, MDC.; Domingo Beltran, M.; Luna Molina, R.; Satorre, MÁ. (2019). An experimental test for effective medium approximations (EMAs) Porosity determination for ices of astrophysical interest. Astronomy and Astrophysics. 628(A63):1-5. https://doi.org/10.1051/0004-6361/201935153 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion https://doi.org/10.1051/0004-6361/201935153 es_ES
dc.description.upvformatpinicio 1 es_ES
dc.description.upvformatpfin 5 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 628 es_ES
dc.description.issue A63 es_ES
dc.relation.pasarela S\400551 es_ES
dc.contributor.funder Agencia Estatal de Investigación es_ES


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