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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
Hydrogenation at low temperatures does not always lead to saturation: the case of HNCO
Context. It is generally agreed that hydrogenation reactions dominate chemistry on grain surfaces in cold, dense molecular cores, saturating the molecules present in ice mantles. Aims. We present aExpand
Diffusion measurements of CO, HNCO, H2CO, and NH3 in amorphous water ice
Context. Water is the major component of the interstellar ice mantle. In interstellar ice, chemical reactivity is limited by the diffusion of the reacting molecules, which are usually present atExpand
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
The desorption of H2CO from interstellar grains analogues
Context. Much of the formaldehyde (H2CO) is formed from the hydrogenation of CO on interstellar dust grains, and is released in the gas phase in hot core regions. Radio-astronomical observations inExpand
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