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![[Figure 1]](vv5019fig1mag.jpg)
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Figure 1
Schematic diagram of the experimental layout of an energy-dispersive diffraction experiment. The shaded regions denote the gauge volume; the region from which diffraction information is measured. An energy-dispersive detector, D, is collimated by the primary, a, and secondary, b, slits, which are perpendicular to the beam diffracted at an angle φ. The two slits are a distance c apart, and the primary slit is a distance e from the centre of the goniometer, O. The acceptance angle of the slits is given by 2α. The distances f and g denote the upstream and downstream lengths of the gauge volume at the centre of the incident beam from the centre of the goniometer. The total length of the gauge volume is given by the distance between the projection of points 1 and 3 onto the centre line of the incident beam. The length of the central region of the gauge volume is given by the distance between the projection of points 2 and 4 onto the centre line of the incident beam. (a) Divergent beam. The apparent source, S, is a distance R from the centre of the goniometer, and has a divergence of 2δ. (b) Parallel beam. The incident beam has a height of h. |
![[Figure 1]](vv5019fig1.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
