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Femtosecond pH jump: dynamics of acid—base reactions in solvent cages

Kim, Sang Kyu and Wang, Juen-Kai and Zewail, Ahmed H. (1994) Femtosecond pH jump: dynamics of acid—base reactions in solvent cages. Chemical Physics Letters, 228 (4-5). pp. 369-378. ISSN 0009-2614.

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Studies are reported of the dynamics of proton-transfer reactions, with sub-picosecond time resolution, in solvent cages. The acid—base system studied in a molecular beam is 1-naphthol as a solute and ammonia (or water) as a solvent, with the number of solvent molecules (n) varying. At the threshold (n=3) for proton transfer we examine the accurate form of the decay, which has an apparent biexponential character, and we relate it to the nature of deprotonation and recombination. From studies of the effect of the total energy, isotope substitution and solvent number (n), we discuss the nature of the transfer and the interplay between the local structure of the base solvent and the dynamics.

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Additional Information:© 1994 Elsevier Science B.V. Received 19 July 1994; in final form 3 August 1994. The helpful discussions with Dr. J.A. Syage, and Professor P.M. Felker, Professor E.R. Bernstein, and Professor M. Okumura are greatly appreciated. We wish to also thank the referee for the valuable suggestions, and Mr. Q. Liu and A. Heikal for their help. This work was supported by a grant from the National Science Foundation.
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Arthur Amos Noyes Laboratory of Chemical Physics8968
Issue or Number:4-5
Record Number:CaltechAUTHORS:20160825-105755200
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Official Citation:Sang Kyu Kim, Juen-Kai Wang, Ahmed H. Zewail, Femtosecond pH jump: dynamics of acid—base reactions in solvent cages, Chemical Physics Letters, Volume 228, Issues 4–5, 7 October 1994, Pages 369-378, ISSN 0009-2614, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69938
Deposited By: Ruth Sustaita
Deposited On:26 Aug 2016 15:56
Last Modified:03 Oct 2019 10:26

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