Experimental (IMAGE) National Institutes of Natural Sciences Caption Simultaneous observation of the H/D isotopic exchange of water molecules at the surface and in the interior of well-defined double-layer ice films composed of H<sub>2</sub>O and D<sub>2</sub>O. Credit NINS/IMS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.