期刊
COMPUTATIONAL MATERIALS SCIENCE
卷 32, 期 1, 页码 96-106出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.commatsci.2004.04.007
关键词
wet electron; solvated electron; water surface; density functional theory
Dynamics of electron solvation at the water surface is studied using extensive ab initio simulations. Calculations have been performed on semi-classical water at 300 K temperature with an excess quantum electron on its surface. It is found that after a very fast 30-50 fs initial localization, there follow fast 50-70 fs rotationally mediated transitions of the excess electron between surface trap states with a lifetime of 150-400 fs. In less then 2 ps the excess electron gets trapped in an ordered floating electron state on the surface of water with a lifetime of more than 7 ps. The excess electron diffusion coefficient and spectrum of its velocity autocorrelation function change over time to reflect a transition from a very mobile phase (first 2 ps) to a trapped floating electron phase (2-7 ps). (C) 2004 Elsevier B.V. All rights reserved.
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