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The study focuses on the mutual neutralization reaction between hydronium (HO) and hydroxide (OH) ions, which is a basic yet not well-understood chemical process.
Using advanced imaging techniques in a cryogenic ion storage facility, researchers observed the products formed during these reactions at low collision energies.
The findings reveal that most of the reactions involve electron-transfer mechanisms, while some also involve proton transfer, helping to create a basis for future modeling of charge-transfer processes.
Article Abstract
Mutual neutralization of hydronium (HO) 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 HO + OH + H and 2OH + H product channels and attributed them to an electron-transfer mechanism, whereas a minor contribution of HO + HO 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.
