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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Danger, Gregoire
Aix-Marseille University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2015Hydrogenation at low temperatures does not always lead to saturation: the case of HNCOcitations
- 2014Formaldehyde chemistry in cometary ices: implication for the Rosetta mission
- 2013Importance of thermal reactivity for hexamethylenetetramine formation from simulated interstellar icescitations
- 2013The thermal reactivity of HCN and NH<SUB>3</SUB> in interstellar ice analoguescitations
- 2012The desorption of H<SUB>2</SUB>CO from interstellar grains analoguescitations
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article
Hydrogenation at low temperatures does not always lead to saturation: the case of HNCO
Abstract
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. <BR /> Aims: We present a study of the low temperature reactivity of solid phase isocyanic acid (HNCO) with hydrogen atoms, with the aim of elucidating its reaction network. <BR /> Methods: Fourier transform infrared spectroscopy and mass spectrometry were employed to follow the evolution of pure HNCO ice during bombardment with H atoms. Both multilayer and monolayer regimes were investigated. <BR /> Results: The hydrogenation of HNCO does not produce detectable amounts of formamide (NH<SUB>2</SUB>CHO) as the major product. Experiments using deuterium reveal that deuteration of solid HNCO occurs rapidly, probably via cyclic reaction paths regenerating HNCO. Chemical desorption during these reaction cycles leads to loss of HNCO from the surface. <BR /> Conclusions: It is unlikely that significant quantities of NH<SUB>2</SUB>CHO form from HNCO. In dense regions, however, deuteration of HNCO will occur. HNCO and DNCO will be introduced into the gas phase, even at low temperatures, as a result of chemical desorption....