Materials Chemistry- EH3

The main technique used in EH3 will be angle-dispersive x-ray diffraction using two-dimensional area detectors. These are well suited to high-energy experiments as the Bragg angles are small for the short wavelengths used. This means that complete Debye-Scherrer cones may be captured. This primary technique can be coupled to absorption contrast tomography, SAXS etc as required. In addition, a suite of sample environment and complimentary spectroscopies are available.

Key points

  • Energy range, monochromatic 20 < E < 150 KeV
  • Beam sizes from 1 µm to 8 mm

Techniques

  • Angular dispersive diffraction using area detectors
  • Pair distribution function experiments
  • X-ray imaging, fast tomography, diffraction tomography

 

Experimental hutch overview

As shown below, EH3 contains four main elements mounted on highly stable granite platforms. From right to left, these are 1) Secondary focusing using compound refractive lenses; 2) A sample stage containing both heavy and light duty sample towers; 3) A detector stage with long translations; and 4) An ancillary table offering the ability to mount a SAXS detector.

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X-ray diffraction detectors

EH3 will be equipped with two main detectors, the first is a Perkin Elemer flat panel, inherited from the old ID15. This is a work-horse detector suitable for a wide range of materials chemistry problems requiring a large active area (40 x 40 cm) and modest speeds (10 Hz). The second detector is a Dectris Pilatus X utilising a CdTe sensor. Note that this detector will be shared with ID31 on a case-by-case basis. Ask your local contact for more details.

 

X-ray imaging detectors

A range of imaging cameras are available for experiments which require complimentary absorption tomography. This includes the PCO Dimax and associated optics. Ask your local contact for more details.

 

Ancillary equipment

The beamline retains access to all of the equipment held in the sample environment pool. In addition, a dedicated Hiden QGA mass spectrometer is available. Together with our large stock of mass flow controllers, regulators and Swagelok fittings, this means that custom experiments for e.g. heterogeneous catalysis may be performed. Finally, a Hitachi Vortex fluorescence detector with a special 1mm thick Si crystal for high energies is available.

 

Scientific Techniques

The new beam line aims to make techniques like diffraction tomography, pair distribution function analysis etc routinely accessible to the full ESRF user community. Please see the Scientific Examples page for more information.