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Science 29 September 2006:
Vol. 313. no. 5795, p. 1849
DOI: 10.1126/science.313.5795.1849m
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Ultrafast infrared spectroscopy has offered an increasingly detailed picture of the constant hydrogen-bonding rearrangements that characterize bulk water. McGuire and Shen (p. 1945) extend this exploration to interfacial water and used sum frequency generation to selectively probe surface OH stretches. The subpicosecond dynamics of aqueous vibrations at a hydrophilic (silica) and hydrophobic (octadecyltrichlorosilane) interface resemble the documented behavior of bulk water, although the dangling OH bonds in the hydrophobic system relax more slowly after excitation. Thus, the dynamics appear to depend mainly on local hydrogen bonding interactions, rather than on long-range ordering effects that differ between surface and bulk.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)