Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/28878
DC Field | Value | Language |
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dc.contributor.author | STEFANI, STEFANIA | en_US |
dc.contributor.author | PICCIONI, GIUSEPPE | en_US |
dc.contributor.author | Snels, M. | en_US |
dc.contributor.author | Adriani, A. | en_US |
dc.contributor.author | Grassi, D. | en_US |
dc.date.accessioned | 2020-12-16T10:39:06Z | - |
dc.date.available | 2020-12-16T10:39:06Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0037-8720 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/28878 | - |
dc.description.abstract | In this work we present two experimental setup able to characterize the optical properties of gases, in particular CO_2 and H_2, at typically planetary conditions. The apparatus consists of a Fourier Transform InfraRed (FT-IT) interferometer able to work in a wide spectral range, from 350 to 25000 cm<SUP>-1</SUP> (0.4 to 29 mu m ) with a relatively high spectral resolution, from 10 to 0.07 cm<SUP>-1</SUP>. Two dedicated gas cells have been integrated with the FT-IR. The first, called High Pressure High Temperature (HP-HT), can support pressures up to 300 bar, temperatures up to 300<SUP>o</SUP>C and is characterized by an optical path of 2 cm. The second one, a Multi Pass (MP) absorption gas cell, is designed to have a variable optical path, from 2.5 to 30 m, can be heated up to 200<SUP>o</SUP> and operate at pressures up to 10 bar. In this paper, measurements of Collision-Induced Absorption (CIA) bands in carbon dioxide and hydrogen recorded in the InfraRed spectral range will be presented. In principle, linear symmetric molecules such as CO_2 and H_2 possess no dipole moment, but, even when the pressure is only a few bar, we have observed the Collisional Induced Absorption (CIA) bands. This absorption results from a short-time collisional interaction between molecules. The band integrated intensity shows a quadratic dependence versus density opposed to the absorption by isolated molecules, which follows Beer's law \citep{Beer's}. This behaviour suggests an absorption by pairs rather than by individual molecules. The bands integrated intensities show a linear dependence vs square density according to \citep {CIA Shape} and \citep{CIA posi}. For what concerns the H_2 CIA bands, a preliminary comparison between simulated data obtained with the model described in \citep{CIA H2}and measured, shows a good agreement. These processes are very relevant in the dense atmospheres of planets, such as those of Venus and Jupiter and also in extrasolar planets. A detailed knowledge of these contributions is very important to include this effect in the radiative transfer calculations. | en_US |
dc.language.iso | eng | en_US |
dc.title | Collisional Induced Absorption (CIA) bands measured in the IR spectral range | en_US |
dc.type | Article | - |
dc.identifier.url | http://sait.oat.ts.astro.it/MSAIt870116/index.html | en_US |
dc.relation.medium | ELETTRONICO | en_US |
dc.relation.volume | 87 | en_US |
dc.relation.firstpage | 208 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.international | no | en_US |
dc.contributor.country | ITA | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MEMORIE DELLA SOCIETA ASTRONOMICA ITALIANA | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016MmSAI..87..208S | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.fulltext | With Fulltext | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
crisitem.journal.journalissn | 0037-8720 | - |
crisitem.journal.ance | E108779 | - |
crisitem.author.dept | IAPS Roma | - |
crisitem.author.dept | IAPS Roma | - |
crisitem.author.dept | IAPS Roma | - |
crisitem.author.orcid | 0000-0001-5762-4947 | - |
crisitem.author.orcid | 0000-0002-7893-6808 | - |
crisitem.author.orcid | 0000-0003-4998-8008 | - |
crisitem.author.orcid | 0000-0003-1653-3066 | - |
Appears in Collections: | 1.01 Articoli in rivista |
Files in This Item:
File | Description | Size | Format | |
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2016MmSAI__87__208S.pdf | Pdf editoriale | 147.73 kB | Adobe PDF | View/Open |
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