Thermal desorption of CH4 retained in CO2 ice |
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| Authors: | Ramón Luna Carlos Millán Manuel Domingo Miguel Ángel Satorre |
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| Institution: | (1) Escuela Politécnica Superior de Alcoy (UPV), 03801 Alicante, Spain;(2) Escuela Politécnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica (UPV), 46022 Valencia, Spain |
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| Abstract: | CO2 ices are known to exist in different astrophysical environments. In spite of this, its physical properties (structure, density,
refractive index) have not been as widely studied as those of water ice. It would be of great value to study the adsorption
properties of this ice in conditions related to astrophysical environments. In this paper, we explore the possibility that
CO2 traps relevant molecules in astrophysical environments at temperatures higher than expected from their characteristic sublimation
point. To fulfil this aim we have carried out desorption experiments under High Vacuum conditions based on a Quartz Crystal
Microbalance and additionally monitored with a Quadrupole Mass Spectrometer. From our results, the presence of CH4 in the solid phase above the sublimation temperature in some astrophysical scenarios could be explained by the presence of
several retaining mechanisms related to the structure of CO2 ice. |
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| Keywords: | Methods: laboratory Techniques: miscellaneous Planets and satellites: general ISM: general |
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