Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...530a..96t&link_type=abstract
Astronomy & Astrophysics, Volume 530, id.A96
Astronomy and Astrophysics
Astrophysics
3
Astrochemistry, Ism: Molecules, Molecular Processes, Molecular Data
Scientific paper
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 H2O. 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 + H2O → OCN- + H3O+ and OCN- + H3O+ → HOCN + H2O 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 H2O + HNCO reaction alone cannot account for the observed abundances of solid OCN- in astronomical IR sources.
Chiavassa T.
Coussan S.
Danger Grégoire
Duvernay F.
Hasegawa Takuya
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