Highly Compressed Two-Dimensional Form of Water at Ambient Conditions
2013 (English)In: Scientific Reports, ISSN 2045-2322, Vol. 3, 1074Article in journal (Refereed) Published
The structure of thin-film water on a BaF2(111) surface under ambient conditions was studied using x-ray absorption spectroscopy from ambient to supercooled temperatures at relative humidity up to 95%. No hexagonal ice-like structure was observed in spite of the expected templating effect of the lattice-matched (111) surface. The oxygen K-edge x-ray absorption spectrum of liquid thin-film water on BaF2 exhibits, at all temperatures, a strong resemblance to that of high-density phases for which the observed spectroscopic features correlate linearly with the density. Surprisingly, the highly compressed, high-density thin-film liquid water is found to be stable from ambient (300 K) to supercooled (259 K) temperatures, although a lower-density liquid would be expected at supercooled conditions. Molecular dynamics simulations indicate that the first layer water on BaF2(111) is indeed in a unique local structure that resembles high-density water, with a strongly collapsed second coordination shell.
Place, publisher, year, edition, pages
2013. Vol. 3, 1074
Research subject Theoretical Physics
IdentifiersURN: urn:nbn:se:su:diva-88360DOI: 10.1038/srep01074ISI: 000313551300002OAI: oai:DiVA.org:su-88360DiVA: diva2:612954