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Título: | Diffusion of methane on amorphous solid water |
Autor: | Maté, Belén CSIC ORCID; Molpeceres, Germán CSIC ORCID; Ortigoso, Juan CSIC ORCID; Tanarro, Isabel CSIC ORCID ; Herrero, Víctor J. CSIC ORCID | Fecha de publicación: | 21-nov-2016 | Citación: | ECLA (2016) | Resumen: | Icy mantles covering dust grains in dense clouds of the interstellar medium are known to be responsible of the large molecular complexity of our universe. Within those mantles atoms and molecules can meet and react with higher probability than in the gas phase. The chemical reactivity of interstellar ice is limited by the diffusion of reacting atoms or molecules in water ice, its major component. For this reason the knowledge of diffusion coefficients of different molecules in water ice is of great astrophysical interest. In this work we have designed an experiment to determine the thermal diffusion of CH4 in ASW at temperatures between 45 K and 60 K. In a high vacuum chamber methane ice layers covered by water layers were grown by vapor deposition at 30 K. Then, the two-layered system was warmed to the temperature of interest and kept at that temperature while the diffusion of CH4 molecules was monitored by means of FTIR spectroscopy. The decay of intensity with time of the strong IR absorption associated to the ¿3 mode of methane (see Figure1) is a measure of the number of methane molecules that have moved through the pores of the ASW layer and left the sample. Diffusion coefficients were extracted from the isothermal experiments using Fick¿s second law of diffusion [1,2]. The effect on the results of ASW compactation upon annealing will be discussed. | Descripción: | European Conference on Laboratory Astrophysics, ECLA (2016): "Gas on the Rocks"; Madrid, CSIC; November 21 - 25, 2016; http://www.ecla2016.com/index.php/scientific-program/posters | URI: | http://hdl.handle.net/10261/154573 |
Aparece en las colecciones: | (CFMAC-IEM) Comunicaciones congresos |
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