Four-circle diffractometer with three-axis energy analysis

Simulated single crystal diffraction experiment

  • Here D10 is set for a single crystal diffraction experiment in the 4-circle geometry.
  • The polychromatic beam from the thermal neutron guide H24 arrives on the monochromator, which selects a given wavelength.
  • The monochromatic beam passes through slits to limit its size before reaching the sample.
  • The sample, usually a single crystal in a gas flow helium cryostat, is at the center of the eulerian cradle.
  • The three axes ω,χ,ϕ of the Eulerian cradle are rotated until a given set of atomic planes diffract into the equatorial plane.
  • The detector is rotated to the location of the diffracted beam, which is then scanned step by step.

This makes it possible to record the intensities of a large number of Bragg reflections, from which the atomic structure of the sample can be obtained.