ORCID Profile
0000-0003-4107-0980
Current Organisation
CNRS
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Publisher: EDP Sciences
Date: 05-2013
Publisher: Elsevier BV
Date: 10-2013
Publisher: EDP Sciences
Date: 26-01-2017
DOI: 10.1051/0004-6361/201526383
Abstract: Context. Molecular hydrogen (H 2 ) is the most abundant molecule of the interstellar medium (ISM) in gas phase and it has been assumed to exist in solid state or as coating on grains. Aims. Our goal is to show that solid H 2 can act as a hydrogenation agent, reacting with CN radicals to form HCN. Methods. In a H 2 matrix, we studied the hydrogenation of the CN radical generated from the vacuum ultraviolet photolysis (VUV-photolysis) of C 2 N 2 at 3.8 K. We modified the wavelengths and the host gas in order to be sure that CN radicals can abstract H from H 2 molecules. Results. HCN monomers, dimers, and oligomers have been characterised by Fourier transform infrared spectroscopy (FTIR). H 2 CN as well as CN radicals have also been clearly observed during the photolysis performed at 3.8 K. Conclusions. H 2 is a hydrogenation reagent towards CN radicals producing HCN. This type of reaction should be taken into account for the reactivity at low temperature in contaminated H 2 ice macro-particles (CHIMPs), H 2 flakes or in the first sublayers of grains where solid H 2 has accumulated.
Publisher: American Chemical Society (ACS)
Date: 28-02-2012
DOI: 10.1021/JP3000653
Abstract: We focus on low temperature reactivity from 25 to 300 K, in ice containing acetaldehyde, ammonia, and formic acid. We show that the warming of this ice mixture forms the acetaldehyde ammonia trimer (2,4,6-trimethyl-1,3,5-hexahydrotriazine, C(6)H(15)N(3)) after five steps. The reaction is monitored by FTIR spectroscopy and mass spectrometry. We propose a mechanism for its formation that differs from the one proposed in the liquid phase. The reaction intermediates, α-aminoethanol (from 80 K) and ethanimine (formed at 180 K), have been identified by a mechanistic approach: each step of the reaction has been treated separately. The chemical implications and the astrophysical relevance of the study are also discussed.
Publisher: Wiley
Date: 28-11-2015
DOI: 10.1002/POC.3380
Publisher: EDP Sciences
Date: 14-12-2013
Publisher: American Chemical Society (ACS)
Date: 16-11-2001
DOI: 10.1021/JA016826Y
No related grants have been discovered for Vassilissa Vinogradoff.