Two new diffractometers at BM20/ESRF for single crystal, powder and surface diffraction


Two new diffractometers at BM20/ESRF for single crystal, powder and surface diffraction

Hennig, C.; Schmidt, M.; Ikeda-Ohno, A.; Radoske, T.; Feig, M.; Findeisen, S.; Claußner, J.; Exner, J.; Naudet, D.; Baumann, N.; Scheinost, A.

The Institute of Resource Ecology / Helmholtz-Zentrum Dresden-Rossendorf is operating the Rossendorf Beamline (ROBL/BM20) at the European Synchrotron Radiation Facility (ESRF) for 20 years. We are constructing a second experimental hutch with two new diffractometers for single crystal, powder and surface diffraction. The single crystal diffractometer is foreseen for small and large molecule crystallography, mainly for structures with heavy metals. This diffractometer is equipped with a Pilatus3 X 2M detector mounted in a sturdy metal frame on a granite table. Sample-detector distances can be varied between 140 und 600mm. Three goniometers are available to mount single crystals: a Huber Kappa goniometer 512.410, an Arinax Kappa MK3, and a Huber uniaxial goniometer 410. The energy range of 5-35keV allows the application of anomalous dispersion. In-situ experiments on single crystals and powders are supported. Diffraction measurements can be combined simultaneously with XANES and XRF spectroscopy using a Vortex X90 CUBE silicon drift detector with a FalconX1 processor.
The second diffractometer will be used for surface diffraction and moderate high-resolution powder diffraction. This diffractometer is a 6-circle Huber diffractometer with Eulerian cradle geometry. Surface and powder diffraction techniques comprise specific setups. Both techniques will use a Pilatus 100k detector. The resolution for powder diffraction using the Pilatus 100k detector does not reach the resolution of synchrotron diffractometers with secondary analyzer crystals, but provides a magnitude better resolution than lab diffractometers. A specific support allows the installation of the Vortex X90 detector also on this diffractometer. The setup comprises a cryo cooler (80-400 K) and a heater (up to 1200 K) which can be installed at both diffractometers. The experimental hutch is equipped for the use of radioactive material.

Keywords: Single crystall diffraction; powder diffraction; surface diffraction; Rossendorf Beamline

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