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Figure 9
The 004 diffraction space map (logarithmic scale) expanded normal to the crystal truncation rod to emphasize the wavy streak of the 80 Å In0.15Ga0.85As quantum well, buried in a complex AlGaAs/GaAs structure. The other dominant feature is the streak along 2θB. When the data were projected along 2θB, the resultant profile fitted precisely with the simulation based on dynamical theory. Collecting data with a high-resolution diffractometer without an analyser (a rocking curve) gave small fringe displacements with a broadened base to the substrate peak (a commonly observed feature, which can be associated with the 2θB enhancement for varying Ω), whereas a single scan along the crystal truncation rod gave regions of missing intensity.

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ISSN: 2053-2733
Volume 74| Part 5| September 2018| Pages 457-465
https://doi.org/10.1107/S2053273318007489
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