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High-energy x-ray diffraction reveals that isotopic quantum effects in water decrease with rising temperature, indicating significant impacts on isotope substitution experiments.
The technique of high energy x-ray diffraction has been used to measure the temperature variation of hydrogen versus deuterium isotopic quantum effects on the structure of water. The magnitude of the effect is found to be inversely proportional to the temperature, varying by a factor of 2.5 over the range 6 to 45 ^∘{}C. In addition, the H₂¹⁶O versus H₂¹⁸O effect has been measured at 26 ^∘{}C and the structural difference shown to be restricted to the nearest neighbor molecular interactions. The results are compared to recent simulations and previously measured isochoric temperature differentials; additionally, implications for H/D substitution experiments are considered.
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Hart et al. (2005) studied this question.
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