Experimental and modeling study of the ion-molecule association reaction H3O++H2O(+M)-> H5O2+(+M)

2005 | journal article. A publication of Göttingen

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​Experimental and modeling study of the ion-molecule association reaction H3O++H2O(+M)-> H5O2+(+M)​
Hamon, S.; Speck, T.; Mitchell, J.; Rowe, B. & Troe, J.​ (2005) 
The Journal of Chemical Physics123(5) art. 054303​.​ DOI: https://doi.org/10.1063/1.1935520 

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Hamon, S.; Speck, Thomas; Mitchell, JBA; Rowe, B.; Troe, Juergen
Experimental results for the rate of the association reaction H3O++H2O(+M)-> H5O2+(+M) obtained with the Cinetique de Reactions en Ecoulement Supersonique Uniforme flow technique are reported. The reaction was studied in the bath gases M=He and N-2, over the temperature range of 23-170 K, and at pressures between 0.16 and 3.1 mbar. At the highest temperatures, the reaction was found to be close to the limiting low-pressure termolecular range, whereas the limiting high-pressure bimolecular range was approached at the lowest temperatures. Whereas the low-pressure rate coefficients can satisfactorily be reproduced by standard unimolecular rate theory, the derived high-pressure rate coefficients in the bath gas He at the lowest temperatures are found to be markedly smaller than given by simple ion-dipole capture theory. This result differs from previous observations on the related reaction NH4++NH3(+M)-> N2H7+(+M). This observation is tentatively attributed to more pronounced contributions of the valence part of the potential-energy surface to the reaction in H5O2+ than in N2H7+. Falloff curves of the reaction H3O++H2O(+M)-> H5O2+(+M) are constructed over wide ranges of conditions and represented in compact analytical form. (C) 2005 American Institute of Physics.
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Amer Inst Physics
The Journal of Chemical Physics 



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