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Anomalous Quantum Effect in the Thermal Expansion of Ice  
A team of researchers from the Department, along with colleagues from the Universidad Autonoma de Madrid (UAM) in Spain, explain a puzzling water anomaly in a paper published in the May 9 edition of Physical Review Letters entitled, "Anomalous Nuclear Quantum Effects in Ice". Marivi Fernandez-Serra, Phil Allen, Peter Stephens, and PhD student Betul Pamuk, in collaboration with three UAM professors show that the volume of water (H2O) ice depends on the quantum zero-point motion of the H and O atoms in an opposite way from "normal" materials. The theoretical model proposed, which is backed by careful computational modeling and an X-ray diffraction experiment at Brookhaven National Laboratory’s National Synchrotron Light Source, attributes the effect to the peculiar nature of the hydrogen bond. See more at Mariv's WEB page, and at the University's WEB site.

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