Abstract
The neutron reflectivity from Si/D 2O and Si/H 2O–D 2O interfaces at room temperature has been investigated in considerable detail. The silicon wafer used had a hydrophobic coating. The analysis of the experimental results shows: (1) the behaviour of the reflectivities R( Q) for Q≲ Q c ( Q c being the wave number of the total reflection edge) follows the conventional theory; (2) the mixtures exhibit enhanced reflectivities – as compared with conventional expectations – for momentum transfers Q higher than Q c. Result (2) reveals a new phenomenon, which among other aspects shows that one of the basic hypotheses in all previous H 2O–D 2O contrast variation work, the assumption of homogeneity in the isotopic concentration in the liquid, is questionable. This phenomenon can be a signature of (a) protonic quantum entanglement as suggested by one of the authors (C.A.C.-D.), or (b) of a hitherto unexplored physical chemistry of isotope mixtures near surfaces.
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