Electrons in finite-sized water cavities: Hydration dynamics observed in real time

D. Hern Paik, I. Ren Lee, Ding Shyue Yang, J. Spencer Baskin, Ahmed H. Zewail*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

208 引文 斯高帕斯(Scopus)

摘要

We directly observed the hydration dynamics of an excess electron in the finite-sized water clusters of (H2O)n- with n = 15, 20, 25, 30, and 35. We initiated the solvent motion by exciting the hydrated electron in the cluster. By resolving the binding energy of the excess electron in real time with femtosecond resolution, we captured the ultrafast dynamics of the electron in the presolvated ("wet") and hydrated states and obtained, as a function of cluster size, the subsequent relaxation times. The solvation time (300 femtoseconds) after the internal conversion [140 femtoseconds for (H2O)35-] was similar to that of bulk water, indicating the dominant role of the local water structure in the dynamics of hydration. In contrast, the relaxation in other nuclear coordinates was on a much longer time scale (2 to 10 picoseconds) and depended critically on cluster size.

原文英語
頁(從 - 到)672-675
頁數4
期刊Science
306
發行號5696
DOIs
出版狀態已發佈 - 2004 10月 22
對外發佈

ASJC Scopus subject areas

  • 多學科

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