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Science 19 September 2003:
Vol. 301. no. 5640, pp. 1698 - 1702
DOI: 10.1126/science.1087251
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Reports

Ultrafast Hydrogen-Bond Dynamics in the Infrared Spectroscopy of Water

C. J. Fecko,1,2* J. D. Eaves,1,2* J. J. Loparo,1,2 A. Tokmakoff,1,2{dagger} P. L. Geissler1{ddagger}

We investigated rearrangements of the hydrogen-bond network in water by measuring fluctuations in the OH-stretching frequency of HOD in liquid D2O with femtosecond infrared spectroscopy. Using simulations of an atomistic model of water, we relate these frequency fluctuations to intermolecular dynamics. The model reveals that OH frequency shifts arise from changes in the molecular electric field that acts on the proton. At short times, vibrational dephasing reflects an underdamped oscillation of the hydrogen bond with a period of 170 femtoseconds. At longer times, vibrational correlations decay on a 1.2-picosecond time scale because of collective structural reorganizations.

1 Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.
2 George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.



* These authors contributed equally to this work.

{ddagger} Present address: Department of Chemistry, University of California, Berkeley, CA 94720, USA.

{dagger} To whom correspondence should be addressed. E-mail: tokmakof{at}mit.edu

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