The partial structure factors and pair distribution functions for liquid were measured using the method of neutron scattering and isotopic substitution. The results show many features which are consistent with an ionic melt in which small ions move rapidly through a highly ordered liquid sub-structure in a similar way to the motion of in the fast-ion solid which exists prior to melting. The results are compared with recent molecular dynamics and ab initio molecular dynamics calculations, and the relative merits of the two simulation approaches are discussed in relation to the data.
The partial structure factors of liquid thallium selenide, TlSe, have been determined using a combination of two neutron diffraction measurements using isotopic substitution and one x-ray diffraction measurement. We show that the statistical accuracy obtained using this method is considerably higher than that achievable using neutron diffraction and isotopic substitution alone. The results unambiguously show the formation of Se polyanionic species in the liquid.
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