Abstract
In recent work on the structure of water I have exploited both time-of-flight neutron diffraction (TOF) and conventional reactor neutron diffraction to extract the hydrogen-hydrogen correlation function in liquid water using the technique of hydrogen/deuterium substitution. Because the dynamic effects on the TOF data have a very different dependence on momentum transfer ( Q ) from those for the reactor data, the two sets of data offer a unique opportunity to establish an estimate of the magnitude of the dynamic correction. Apart from a discrepancy at small Q which is not fully understood at present, the different diffraction techniques show good agreement over most of the Q range. The comparison is used to discuss the applicability of the H/D subtraction (which involves no arbitrary fitting parameters) to molecular liquids in general: the main features in the structure factors can be determined readily. On the other hand, it is likely that finer details such as quantum effects will be obscured by experimental imitations.
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