H/D Exchange Process (IMAGE) National Institutes of Natural Sciences Caption Schematic illustration of H/D isotope exchange process of water molecules induced by autoionization and subsequent proton transfer. 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.