Anomalous Nuclear Quantum Effects in Ice

Abstract

One striking anomaly of water ice has been largely neglected and never explained. Replacing hydrogen (${}^1$H) by deuterium (${}^2$H) causes ice to expand, whereas the "normal" isotope effect is volume contraction with increased mass. Furthermore, the anomaly increases with temperature $T$, even though a normal isotope shift should decrease with $T$ and vanish when $T$ is high enough to use classical nuclear motions. In this study, we show that these effects are very well described by {\it ab initio} density functional theory. Our theoretical modeling explains these anomalies, and allows us to predict and to experimentally confirm a counter effect, namely that replacement of ${}^{16}$O by ${}^{18}$O causes a normal lattice contraction.

5 pages, 3 figures

References in corpus (4)

• Competing quantum effects in the dynamics of a flexible water model
• Nuclear quantum effects in water
• Isotope effects in ice Ih: A path-integral simulation
• Quantum path integral simulation of isotope effects in the melting temperature of ice Ih

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