Kinetics of the OCN− and HOCN formation from the HNCO + H2O thermal reaction in interstellar ice analogs - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2011

Kinetics of the OCN− and HOCN formation from the HNCO + H2O thermal reaction in interstellar ice analogs

Résumé

Aims. We study in the laboratory the kinetics of the low-temperature OCN − and HOCN formation from the purely thermal reaction of solid HNCO and H 2 O. The cyanate ion OCN − is an intermediate in the isomerization process of isocyanic acid HNCO into cyanic acid HOCN in water ice. Methods. We study the reaction, isomerization and desorption kinetics of the HNCO/OCN − /HOCN system using Fourier transform infrared spectroscopy. Results. Activation energies of 26 ± 2 kJ mol −1 (3127 K) and 36 ± 1 kJ mol −1 (4330 K) are found for the HNCO + H 2 O → OCN − + H 3 O + and OCN − + H 3 O + → HOCN + H 2 O reactions respectively. Desorption energies of 37 ± 3 kJ mol −1 (4450 K) and 40 ± 3 kJ mol −1 (4811 K) are measured for HNCO and OCN − , respectively. Conclusions. The present experiment has the important implication that the H 2 O + HNCO reaction alone cannot account for the observed abundances of solid OCN − in astronomical IR sources.
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Dates et versions

hal-01076034 , version 1 (20-10-2014)

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P Theule, F Duvernay, A Ilmane, T Hasegawa, O Morata, et al.. Kinetics of the OCN− and HOCN formation from the HNCO + H2O thermal reaction in interstellar ice analogs. Astronomy and Astrophysics - A&A, 2011, 530, pp.A96. ⟨10.1051/0004-6361/201016051⟩. ⟨hal-01076034⟩

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