Structure dynamics of the proton in liquid water probed with terahertz time-domain spectroscopy

We study the hydration of protons in liquid water using terahertz time-domain spectroscopy and polarization-resolved femtosecond midinfrared pump-probe spectroscopy. We observe that the addition of protons leads to a very strong decrease of the dielectric response of liquid water that corresponds to...

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Bibliographic Details
Published in:	Physical review letters Vol. 102; no. 19; p. 198303
Main Authors:	Tielrooij, K J, Timmer, R L A, Bakker, H J, Bonn, M
Format:	Journal Article
Language:	English
Published:	United States 15-05-2009
Subjects:	Hydrogen Bonding Models, Chemical Spectrophotometry, Infrared - methods Water - chemistry
Online Access:	Get full text
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Summary:	We study the hydration of protons in liquid water using terahertz time-domain spectroscopy and polarization-resolved femtosecond midinfrared pump-probe spectroscopy. We observe that the addition of protons leads to a very strong decrease of the dielectric response of liquid water that corresponds to 19+/-2 water molecules per dissolved proton. This depolarization results from water molecules ( approximately 4) that are irrotationally bound to the proton and from the motion of water (corresponding to the response of approximately 15 water molecules) involved in the transfer of the proton charge.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.102.198303