Abstract
Abstract Previous experiments on the neutron structure factor S ( q ) for heavy water near 11.2°C have been extended so that the next term in the Taylor expansion may be examined. An improved result for the isochoric temperature derivative of S ( q ) at 11.2°C is obtained. These data and those for the (Δ T ) 2 coefficient in the Taylor expansion may be explained on a simple basis: namely that OH and HH distances between neighbouring molecules vary as ( T t 0 ) −n where ( T T 0 ) ≈ 1200 n for T ≈ 300 K.
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