The mutual neutralization of hydronium and hydroxide

• 成果类型: Article
• 署名作者: Bogot, Alon; Poline, Mathias; Ji, MingChao; Dochain, Arnaud; Simonsson, Ansgar; Rosen, Stefan; Zettergren, Henning; Schmidt, Henning T.; Thomas, Richard D.; Strasser, Daniel
• 署名单位: Hebrew University of Jerusalem; Stockholm University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10226
• DOI: 10.1126/science.adk1950
• 发表日期: 2024-01-19
• 页码: 285-289
• 关键词: c-h trifluoromethylation; trifluoroacetic-acid; complexes; photoelimination; precursors; arenes

摘要

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 + H-2 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.