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2011A&A...530A..96T - Astronomy and Astrophysics, volume 530A, 96-96 (2011/6-1)

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

THEULE P., DUVERNAY F., ILMANE A., HASEGAWA T., MORATA O., COUSSAN S., DANGER G. and CHIAVASSA T.

Abstract (from CDS):

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. We study the reaction, isomerization and desorption kinetics of the HNCO/OCN/HOCN system using Fourier transform infrared spectroscopy. Activation energies of 26±2kJ/mol (3127K) and 36±1kJ/mol (4330K) are found for the HNCO+H2O->OCN+H3O+ and OCN+H3O+->HOCN+H2O reactions respectively. Desorption energies of 37±3kJ/mol (4450K) and 40±3kJ/mol (4811K) are measured for HNCO and OCN, respectively. 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.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: molecules - molecular processes - molecular data

Simbad objects: 8

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