Real-time observation of bimodal proton transfer in acid-base pairs in water

Matteo Rini, Ben Zion Magnes, Ehud Pines, Erik T.J. Nibbering

Research output: Contribution to journalArticlepeer-review

420 Scopus citations


The neutralization reaction between an acid and a base in water, triggered after optical excitation, was studied by femtosecond vibrational spectroscopy. Bimodal dynamics were observed. In hydrogen-bonded acid-base complexes, the proton transfer proceeds extremely fast (within 150 femtoseconds). In encounter pairs formed by diffusion of uncomplexed photoacid and base molecules, the reaction upon contact was an order of magnitude slower, in agreement with earlier reported values. These results call for a refinement of the traditional Eigen-Weller picture of acid-base reactions: A three-stage model is introduced to account for all observed dynamics.

Original languageEnglish
Pages (from-to)349-352
Number of pages4
Issue number5631
StatePublished - 18 Jul 2003

ASJC Scopus subject areas

  • General


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