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Figure 7
(a) Calculated intensity variation versus Qx at Qz = 0.2412 Å−1 (L = 0.25) for the X-ray beam on the terrace (solid black line) and on the step (dashed red line). Note that the peak of the structure factor is laterally displaced in Qx when the beam is centered on the step (owing to the tilting of the rod as seen in Fig. 6[link]) and that the two curves cross periodically. (b) Simulated one-dimensional `images' showing the variation of the calculated intensity as the beam is scanned across a step for selected values of Qx, indicated by the arrows in (a). Note how the change in step contrast, negative for Qx < 0.014 Å−1 but positive for Qx > 0.014 Å−1, corresponds to whether the step structure factor is smaller or larger than the terrace structure factor at these Qx values as shown in (a).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 15| Part 6| October 2008| Pages 558-571
doi:10.1107/S0909049508023935
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