The mutual neutralization of hydronium and hydroxide

Alon Bogot, Mathias Poline, Ming Chao Ji, Arnaud Dochain, Ansgar Simonsson, Stefan Rosén, Henning Zettergren, Henning T. Schmidt, Richard D. Thomas, Daniel Strasser*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Mutual neutralization of hydronium (H3O+) and hydroxide (OH) ions is a very fundamental chemical reaction. Yet, there is only limited experimental evidence about the underlying reaction mechanisms. Here, we report three-dimensional imaging of coincident neutral products of mutual-neutralization reactions at low collision energies of cold and isolated ions in the cryogenic double electrostatic ion-beam storage ring (DESIREE). We identified predominant H2O + OH + H and 2OH + H2 product channels and attributed them to an electron-transfer mechanism, whereas a minor contribution of H2O + H2O with high internal excitation was attributed to proton transfer. The reported mechanism-resolved internal product excitation, as well as collision-energy and initial ion-temperature dependence, provide a benchmark for modeling charge-transfer mechanisms.

Original languageAmerican English
Pages (from-to)285-289
Number of pages5
Issue number6680
StatePublished - 1 Jan 2024

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