Kinetics of the NH3 and CO2 solid-state reaction at low temperature

J. A. Noble, P. Theule, F. Duvernay, G. Danger, T. Chiavassa, P. Ghesquiere, T. Mineva, D. Talbi

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23 Scopus citations


Ammonia and carbon dioxide play an important role in both atmospheric and interstellar ice chemistries. This work presents a theoretical and experimental study of the kinetics of the low-temperature NH3 and CO2 solid-state reaction in ice films, the product of which is ammonium carbamate (NH4+NH2COO-). It is a first-order reaction with respect to CO2, with a temperature-dependent rate constant fitted to the Arrhenius law in the temperature range 70 K to 90 K, with an activation energy of 5.1 ± 1.6 kJ mol-1 and a pre-exponential factor of 0.09-0.08+1.1 s-1. This work helps to determine the rate of removal of CO2 and NH3, via their conversion into ammonium carbamate, from atmospheric and interstellar ices. We also measure first-order desorption energies of 69.0 ± 0.2 kJ mol-1 and 76.1 ± 0.1 kJ mol-1, assuming a pre-exponential factor of 1013 s-1, for ammonium carbamate and carbamic acid, respectively.

Original languageEnglish
Pages (from-to)23604-23615
Number of pages12
JournalPhysical Chemistry Chemical Physics
Issue number43
StatePublished - Oct 15 2014
Externally publishedYes


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