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Tentative identification of urea and formamide in ISO-SWS infrared spectra of interstellar ices
Laboratory experiments involving vacuum ultraviolet (VUV) irradiation of solid isocyanic acid (HNCO) at 10 K, followed by infrared spectroscopy (FTIR), are used to interpret the complex spectraExpand
Hydrogenation of solid hydrogen cyanide HCN and methanimine CH2NH at low temperature
Context. Hydrogenation reactions dominate grain surface chemistry in dense molecular clouds and lead to the formation of complex saturated molecules in the interstellar medium. Aims. We investigateExpand
Carbamic acid and carbamate formation in NH$_{\sf 3}$:CO$_{\sf 2}$ ices – UV irradiation versus thermal processes
Context. We study carbamic acid [ NH 2 COOH] and ammonium carbamate [ NH 2 COO - ] [ NH 4 + ] formation in interstellar ice analogs. Aims. We demonstrate how carbamic acid [ NH 2 COOH] and ammoniumExpand
The thermal reactivity of HCN and NH3 in interstellar ice analogues
HCN is a molecule central to interstellar chemistry, since i t is the simplest molecule containing a carbon-nitrogen bond and its solid state chemistry is r ich. The aim of this work was to study theExpand
Formation of neutral methylcarbamic acid (CH3NHCOOH) and methylammonium methylcarbamate [CH3NH3+][CH3NHCO2-] at low temperature.
It is shown that amines can react at low temperature in interstellar ices rich in carbon dioxide which are a privileged place of complex molecules formation, before being later released into "hot core" regions. Expand
Experimental study of water-ice catalyzed thermal isomerization of cyanamide into carbodiimide: implication for prebiotic chemistry.
It is shown, by FTIR spectroscopy, that cyanamide can be isomerized in carbodiimide (HNCNH), another interstellar relevant molecule, by a reaction involving the amorphous water-ice surface as catalyst. Expand
Thermal reactions in interstellar ice: A step towards molecular complexity in the interstellar medium
Abstract Complex organic molecules are widely observed in star-forming regions, although their formation mechanisms are not well understood. Solid-state chemistry is thought to play an importantExpand
Interaction of acetic acid with solid water.
The interaction of acetic acid, with solid water, deposited on metals, tungsten and gold, at 80 K, was investigated and it was shown that the initial phase of exposure does not lead to the formation of a top-adsorbed closed water film, and under these conditions no deprotonation of the acid can be detected. Expand
Carbodiimide production from cyanamide by UV irradiation and thermal reaction on amorphous water ice.
It is shown that carbodiimide can be formed from cyanamide at low temperature (10 K), by a photochemical process in argon matrix, in water matrix, or in solid film, which agrees with those expected in the interstellar clouds composed of dust grains in which water is the most predominant compound. Expand
Chemistry induced by low-energy electrons in condensed multilayers of ammonia and carbon dioxide.
A mechanism involving dissociation of NH3 molecules into NH2* and H* radicals is proposed to explain the product formation. Expand