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Phys. Rev. B 70, 180201 (2004) [4 pages]

Reorientational and configurational fluctuations in water observed on molecular length scales

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J. J. Loparo, C. J. Fecko, J. D. Eaves, S. T. Roberts, and A. Tokmakoff
Department of Chemistry and George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Rapid Communication Received 24 September 2004; published 23 November 2004

Polarization-selective pump-probe and echo experiments on the OH vibration of HOD in D2O with 45-femtosecond (fs) infrared pulses are analyzed self-consistently to reveal the time scales for vibrational relaxation, dephasing, and molecular reorientation. Librational motion and hydrogen bond fluctuations on 50- and 180-fs time scales precede picosecond collective reorganization.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.70.180201
DOI: 10.1103/PhysRevB.70.180201
PACS: 78.30.Cp, 78.47.+p

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