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Adsorption of volatile molecules on interstellar carbonaceous dust analogs

AuthorsHerrero, Víctor J. ; Maté, Belén ; Tanarro, Isabel ; Jiménez-Redondo, Miguel ; Peláez, Ramón J. ; Escribano, Rafael
Issue Date14-Apr-2019
PublisherInternational Astronomical Union
CitationIAUS 350: Laboratory Astrophysics: from Observations to Interpretation (2019)
AbstractThe adsorption of molecules on the surface of dust grains is crucial for the physics and chemistry of interstellar clouds. Binding, diusion and reaction of these molecules are determinant for the chemical inventory in many astronomical environments. Dierent groups have investigated the low-temperature interaction of small molecules with various solids like water-ice or silicates present in interstellar grains (see for instance [1-3] ). In this work we study the adsorption of interstellar volatile molecules like H2O, CO2, CO, CH4, on solid deposits of amorphous hydrogenated carbon (HAC) which are taken as analogs of the carbonaceous component of interstellar dust grains. Our experiments are designed as a two step process. First we generate dierent HAC samples through deposition on Al substrates in RF plasmas of suitable precursors (CH4, C2H2 ). In the second step we transfer the substrates with HAC deposits to our UHV chamber (base pressure 1 10 10 mbar) and place them in the cold head of He cryostat. We then introduce the volatile species into the chamber trough multichannel arrays and deposit them on the HAC samples at selected temperatures down to 15 K. We apply re ection absorption IR spectroscopy (RAIRS) and line-of-sight thermal programmed desorption (TPD) to determine binding energies and HAC speci#12;c surface areas by application of simple theoretical models. We will discuss at the meeting the astronomical implications of the results
DescriptionIAU S350, Jesus College, Cambridge, 14-19 April 2019. -- http://www.astrochemistry.org.uk/IAU_S350/
Appears in Collections:(CFMAC-IEM) Comunicaciones congresos
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