A new approach to the structure of 1H-containing materials using polarised neutrons: the cases of liquid methanol and cyclohexane
The main difficulty with structure determination of 1H-containing ('protonated') liquids is the huge incoherent inelastic scattering that arises due to the exceptionally high level of spin-incoherency of the proton (1H). As a result, more than 90 % of the measured signal (using non-polarized neutron beams) from pure H2O, pure CH3OH (methanol) or C6H12 (cyclohexane) is useless ('background') from the structural point of view. Spin-incoherence, however, can be bypassed if the neutron beam is polarized. We have recently shown that using the D3 instrument, it is possible to measure accurate (coherent) static structure factors of water samples, containing a varying proportion of 1H, over a wide Q-range. Even more important perhaps is the fact that the incoherent 'background' could also be determined precisely. Here we propose an experiment for investigating whether the incoherent scattering depends on the chemical environment of the protons, using liquid methanol and cyclohexane. These materials contain the same amount of hydrogen as water, so that comparison of the incoherent backgrounds would provide direct information on the influence of the chemical environment of 1H atoms.
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PUSZTAI Laszlo; CUELLO Gabriel; RODRIGUEZ PALOMINO Luis Alberto; STUNAULT Anne and TEMLEITNER Laszlo. (2015). A new approach to the structure of 1H-containing materials using polarised neutrons: the cases of liquid methanol and cyclohexane. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-02-549
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