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Figure 4
(a) The central splitting taken by a 15 µm-resolution CCD camera for α = 8.5°, τ = 2 s, and for a decreased sample-to-CCD camera distance of 970 mm. The vertical slit was open in order to see the bottoms of the W-groove, which are 0.8 mm apart. Because of higher resolution the field of view is smaller and horizontal lines showing theoretical splitting are outside the image. (b) The vertical slit has been narrowed to take only the diffraction spot from the central inclined walls of the W-groove by a 50 µm-resolution CCD camera and τ = 0.4 s. Horizontal lines again represent theoretical values of central double splitting of the diffracted beam 2Δx.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 8| Part 5| August 2001| Pages 1136-1139
doi:10.1107/S0909049501011050
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