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

被引：37

作者：

Theule, P. ^{[1
]}

Duvernay, F. ^{[1
]}

Ilmane, A. ^{[1
]}

Hasegawa, T. ^{[2
]}

Morata, O. ^{[2
]}

Coussan, S. ^{[1
]}

Danger, G. ^{[1
]}

Chiavassa, T. ^{[1
]}

机构：

[1] Univ Aix Marseille 1, Ctr St Jerome, Lab Phys Interact Ion & Mol, F-13397 Marseille, France

[2] NTU, Acad Sinica, Inst Astron & Astrophys, Taipei, Taiwan

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 530卷

关键词：

astrochemistry; ISM: molecules; molecular processes; molecular data; TIME-DEPENDENT CHEMISTRY; DENSE MOLECULAR CLOUDS; INFRARED-SPECTROSCOPY; ICES; REACTIVITY; EVOLUTION; BAND; ION;

D O I：

10.1051/0004-6361/201016051

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：8

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