Infrared study on the thermal evolution of solid state formamide
Date Issued
2017
Author(s)
•
•
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Compagnini, Giuseppe
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Kaňuchová, Zuzana
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Abstract
Laboratory experiments have shown that the energetic processing, i.e. ion bombardment and UV
photolysis, of interstellar grain mantles and cometary surfaces is efficient in the production of formamide.
To explain its presence in the gas-phase in these astrophysical environments, a desorption mechanism
has to be taken into account. In this work we show experimental results on the thermal evolution of
formamide when deposited at 17 K as pure and in mixture with water or carbon monoxide. In these
samples, we observed formamide desorption at 220 K. Moreover, we discuss its synthesis in a mixture
containing molecular nitrogen, methane and water (N2:CH4:H2O) deposited at 17 K and bombarded with
200 keV H+. Heating the sample, we observed that the newly formed formamide remains trapped in the
refractory residue produced after the ion bombardment up to 296 K. To analyse the samples we used
Fourier transform-infrared spectroscopy (FT-IR) that allowed us to study the infrared spectra between
the deposition and the complete desorption of formamide. Here we discuss the experimental results in
view of their astrophysical relevance.
Volume
19
Issue
32
Start page
21759
Issn Identifier
1463-9076
Ads BibCode
2017PCCP...1921759U
Rights
restricted
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