Thermal desorption of CH4 retained in CO2 ice

Details Thermal desorption of CH4 retained in CO2 ice Thermal desorption of CH4 retained in CO2 ice

2008-01-21

arxiv.org/abs/0801.3205v1

Astrophys.Space Sci.314:113-119,2008

Astronomy and Astrophysics

Astrophysics

8 pages, accepted for publication in Astrophysics & Space Science

Scientific paper

10.1007/s10509-008-9746-2

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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