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Effect of Amorphous Ammonia–Water Ice onto Adsorption of Glycine on Cometary Dust Grain and IR Spectroscopy
Ist Teil von
Journal of physical chemistry. C, 2014-11, Vol.118 (45), p.26080-26090
Ort / Verlag
American Chemical Society
Erscheinungsjahr
2014
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The extraterrestrial origin of glycine has become a topic of great interest for astrobiology and it has been detected bonded to mineral surfaces in the dust of comet 81P/Wild 2 by the Stardust mission. The interactions of organic molecules with the dust grain surfaces shed light on possible routes for life from extraterrestrial space to Earth. The NH3 is one of the volatile components of cometary and interstellar ices. In this work we propose models that describe this scenario that consist of a quaternary system of one glycine molecule, a mixture of amorphous ammonia–water ice, and forsterite (100) surfaces (dipolar and nondipolar). Our quantum mechanical calculations show that the presence of amorphous ammonia/water ice increases the adsorption energy of glycine on the forsterite surface with respect to only amorphous water ice. In addition, we calculated the infrared (IR) frequencies to characterize the most reactive sites in the chemisorption processes with the mineral surface.
Sprache
Englisch
Identifikatoren
ISSN: 1932-7447
eISSN: 1932-7455
DOI: 10.1021/jp507650w
Titel-ID: cdi_crossref_primary_10_1021_jp507650w
Format
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