How does a DAFS experiment work?
The DAFS experiment on BaTiO3 was performed
at beamline BM02 at the European
Synchrotron Radiation Facility (ESRF) in Grenoble, France between
27 November and 1 December, 1997.
![[[Image of a schematic of a DAFS experiment]]](experiment.gif)
- Source
- BM02 is a bending magnet beamline -- a tunable, polarized,
broad band, very bright source of x-rays.
- Monochromator
- BM02 uses a fixed exit assembly of paired (111) silicon crystals,
a sagittally focusing entrance mirror (M1), and a cylindrically
focusing exit mirror (M2). The x-ray energy is determined by
the diffraction angle alpha from the monochromator.
- Slits
- Tantalum knife edges are used to position the beam on the
sample.
- Goniometer
- The sample sits at the eucentric point of a 7--circle goniometer.
Theta and 2Theta track the diffraction peak as the energy is
tuned by the monochromator.
- Detectors
- Here I0 is a scintillation counter and ID
is a photo-diode.
ID / I0 is measured
as a function of energy.
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Bruce Ravel
Last modified: Wed Feb 18 15:56:11 EST
1998