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Single-crystal X-ray diffraction techniques are considered the definitive means of determining the structure of a molecular material. It is an indispensable pillar of synthetic chemistry as it provides definitive confirmation that a target material has been formed. X-ray crystallography, using single-crystal methods, also provides the most accurate means of following the response of a molecular structure to an external influence such as the variation of the thermodynamic variables of pressure and temperature, photo-excitation or, for porous systems, the exchange of a gas.
The high photon flux offered by the beamline allows crystal structure studies of samples that are too weakly scattering, due to either their size or the complexity of their underlying molecular structure, to be successfully carried out using any other X-ray source. These studies underpin chemistry and materials science in strategically important areas such as:
The photon energy can be tuned in the range 5 keV to 25 keV (corresponding to a wavelength range of 2.5 Å to 0.5 Å) with a bandpass of 10-4. This energy tuning capability, which is unique to synchrotron sources, allows crystallographic studies using anomalous dispersion techniques. The narrow bandpass provides sufficient resolution to discriminate specific oxidation states of heavy elements.
Apart from structural chemistry studies, which are carried out in EH1, the beamline offers a variety of sample environment equipment in EH2 allowing structural changes to be mapped under the influence of an external effect. The techniques include:
I19, the small-molecule single-crystal diffraction beamline at Diamond Light Source H. Nowell, S. A. Barnett, K. E. Christensen, S. J. Teat and D. R. Allan
Diamond Light Source is the UK's national synchrotron science facility, located at the Harwell Science and Innovation Campus in Oxfordshire.
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