2012
DOI: 10.1051/0004-6361/201219437
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The desorption of H2CO from interstellar grains analogues

Abstract: Context. Much of the formaldehyde (H 2 CO) 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 in these regions are directly related to its desorption from grains. Aims. We study experimentally the thermal desorption of H 2 CO from bare silicate surfaces, from water ice surfaces and from bulk water ice in order to model its desorption from interstellar grains. Methods. Temperature-programmed desorption experim… Show more

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Cited by 83 publications
(73 citation statements)
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“…This sample was obtained by thermal evaporation of San Carlos olivine (Mg 1.8 Fe 0.2 SiO 4 ) onto a gold-coated substrate (1 cm in diameter). The surface density of adsorption sites is about the same as that found on compact ice samples (Noble et al 2012). Sample preparation and surface analysis are described extensively in Djouadi et al (2005).…”
Section: Methodsmentioning
confidence: 64%
See 1 more Smart Citation
“…This sample was obtained by thermal evaporation of San Carlos olivine (Mg 1.8 Fe 0.2 SiO 4 ) onto a gold-coated substrate (1 cm in diameter). The surface density of adsorption sites is about the same as that found on compact ice samples (Noble et al 2012). Sample preparation and surface analysis are described extensively in Djouadi et al (2005).…”
Section: Methodsmentioning
confidence: 64%
“…Despite some trapping capability of porous ices, the desorption of most volatile species can happen prior to the ice desorption. This can be observed in experiments in which a low heating rate allowing an efficient diffusion of species into the ice is used (Noble et al 2012). Therefore O 2 , N 2 , and CO productions, led by their thermal history, should be correlated if they were present initially in the comets ice.…”
Section: Introductionmentioning
confidence: 96%
“…All the experiments were performed in the submonolayer regime to ensure that the interaction occurred on bare surfaces and was not perturbed by any other layer properties. The surface coverage is known from the specific desorption properties of the second layer (Noble et al 2012b). A typical experiment proceeded as follows: one layer (or less) of non-self-reactive molecules was deposited at low temperature.…”
Section: Methodsmentioning
confidence: 99%
“…In practice the diffusion timescale corresponds to 10 2 to 10 6 s. For a ASW thickness of few hundred layers, this time interval corresponds to diffusion coefficients of 10 −15 cm 2 s −1 to 10 −11 cm 2 s −1 , which corresponds to a certain temperature range according to the molecule. Another time constraint is added if the molecule is reacting with H 2 O, as it is the case for H 2 CO forming HOCH 2 OH (Noble et al 2012) and for HNCO forming H 3 O + OCN − (Theulé et al 2011).…”
Section: The Experimental Protocolmentioning
confidence: 99%
“…11(i. ), the desorption of H 2 CO within multilayer ice is slowed down, because the H 2 CO mantle molecule needs to first diffuse to the upper monolayer (the surface) in order to desorb (Noble et al 2012). The H 2 CO desorption feature is therefore broadened and shifted to higher temperatures, since diffusion delays the H 2 CO. Second, diffusion limits reactivity when reactants are diluted into water ice.…”
Section: Astrophysical Implicationsmentioning
confidence: 99%