S. Baouche
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View article: Experimental H2O formation on carbonaceous dust grains at temperatures up to 85 K
Experimental H2O formation on carbonaceous dust grains at temperatures up to 85 K Open
Water represents the main component of the icy mantles on dust grains, it is of extreme importance for the formation of new species and it represents the main component for life. Water is observed both in the gas-phase and frozen in the in…
View article: VENUS: a new apparatus to investigate surface chemistry routes leading to complex organic molecules in space
VENUS: a new apparatus to investigate surface chemistry routes leading to complex organic molecules in space Open
A multi-beam ultra-high vacuum apparatus is presented. In this article we describe the design and construction of a new laboratory astrophysics experiment -- VErs de NoUvelles Syntheses (VENUS) -- that recreates the solid-state non-energet…
View article: Variation of the sticking of methanol on low-temperature surfaces as a possible obstacle to freeze out in dark clouds
Variation of the sticking of methanol on low-temperature surfaces as a possible obstacle to freeze out in dark clouds Open
Sticking of gas-phase methanol on different cold surfaces – gold, 13CO, and amorphous solid water (ASW) ice – was studied as a function of surface temperature (7–40 K). In an ultrahigh-vacuum system, reflection absorption infrared spectros…
View article: Reactivity of formic acid (HCOOH) with H atoms on cold surfaces of interstellar interest
Reactivity of formic acid (HCOOH) with H atoms on cold surfaces of interstellar interest Open
Context. Formic acid (HCOOH) is the simplest organic carboxylic acid in chemical synthesis and the significant species in interstellar chemistry. HCOOH has been abundantly detected in interstellar ices, dense molecular clouds and star-form…
View article: Experimental and Theoretical Study of the Chemical Network of the Hydrogenation of NO on Interstellar Dust Grains
Experimental and Theoretical Study of the Chemical Network of the Hydrogenation of NO on Interstellar Dust Grains Open
Nitrogen monoxide (NO) is observed in the gas phase of molecular clouds. It may accrete on dust grains, and there its hydrogenation should lead to hydroxylamine (NH2OH), the same way that CO is transformed into methanol (CH3OH) on the surf…
View article: Formation of amines: hydrogenation of nitrile and isonitrile as selective routes in the interstellar medium
Formation of amines: hydrogenation of nitrile and isonitrile as selective routes in the interstellar medium Open
Context. Beyond NH 3 , only one primary alkylamine, CH 3 NH 2 , has been identified in the interstellar medium and the reason why is still not understood: its formation could occur in the gas phase or in icy environments. Aims. To consider…
View article: Efficient formation route of the prebiotic molecule formamide on interstellar dust grains
Efficient formation route of the prebiotic molecule formamide on interstellar dust grains Open
Interstellar complex organic molecules are thought to be the building blocks of more complex prebiotic compounds. In particular, formamide (or methanimide, NH2CHO), is presented as a multifunctional prebiotic precursor, the starting point …
View article: Segregation effect and N<sub>2</sub> binding energy reduction in CO-N<sub>2</sub> systems adsorbed on water ice substrates
Segregation effect and N<sub>2</sub> binding energy reduction in CO-N<sub>2</sub> systems adsorbed on water ice substrates Open
Context . CO and N 2 are two abundant species in molecular clouds. CO molecules are heavily depleted from the gas phase towards the centre of pre-stellar cores, whereas N 2 maintains a high gas phase abundance. For example, in the molecula…
View article: Deuteration of ammonia with D atoms on oxidized partly ASW covered graphite surface
Deuteration of ammonia with D atoms on oxidized partly ASW covered graphite surface Open
The deuteration of ammonia by D atoms has been investigated experimentally in the sub-monolayer regime on realistic analogues of interstellar dust grain surfaces. About 0.8 monolayer of solid NH3 was deposited on top of an oxidized graphit…
View article: Hydrogenation of CO-bearing species on grains: unexpected chemical desorption of CO
Hydrogenation of CO-bearing species on grains: unexpected chemical desorption of CO Open
The amount of methanol in the gas phase and the CO depletion from the gas phase are still open problems in astrophysics. In this work, we investigate solid-state hydrogenation of CO-bearing species via H-exposure of carbon monoxide, formal…