Abstract
The location of hydrogen using powder diffraction techniques has hitherto been extremely difficult using traditional X-ray and neutron diffractometers. With X-rays, hydrogen scatters so weakly in the presence of other nuclei as to be almost invisible, whereas with neutrons, naturally occurring hydrogen produces very large backgrounds, resulting from a large incoherent scattering cross-section, which masks all but the strongest Bragg peaks. Deuteration obviates the above problems in neutron diffraction studies but is an expensive and often complicating option. The considerably higher resolution of the high resolution powder diffractometer, HRPD, at ISIS over similar machines results in a substantial increase in the peak to background ratio thus allowing problems of significant complexity to be tackled
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