Origin of clusters: IV. Low temperature fast-atom bombardment cluster patterns point to the possible existence of NaCl crystalline hydrates incorporating heavy water

摘要

Low temperature fast-atom bombardment study of frozen D_2O-NaCl solutions gave results similar to those obtained earlier for the H_2O-NaCl system. Thus, sets of clusters (D_2O)_n·D~+, (D_2O)_n·Na~+, (D_2O)_n·NaCl·Na~+, (NaCl)_m·Na~+ with a characteristic distribution depending on the composition of the sample and phase transitions on its thawing were recorded. A typical cluster pattern, attributed in the case of the H_2O-NaCl system to a phase of a crystalline hydrate NaCl·2H_2O, was observed for the D_2O-NaCl system as well. At the same time, recently available reference data on the solubility of NaCl do not contain a specification for the formation of a crystalline hydrate on cooling of NaCl solution in D_2O. Considering the present mass spectrometry data, the possibility of incorporation of heavy water into NaCl crystalline hydrates is discussed.