Convergent beam diffraction

Figure Bl.8.7. A convergent beam diffraction pattern of the fivefold axis of a quasicrystal, as in figure Bl.8.6. The diffraction rings show that the synnnetry is fivefold, not tenfold. (Courtesy of L Bendersky.)...

Lattice parameters to four significant figures using convergent beam diffraction... 

Gjonnes, J., Hansen, V., Berg, B. S., Runde, P., Cheng, Y. F., Gjonnes, K., Dorset D. L., Gilmore, C. J. (1998) Structure Model for the Phase Al Ee Derived from Three-Dimensional Electron Diffraction Intensity Data Collected by a Precession Technique. Comparison with Convergent-Beam Diffraction.", Hcta Cryst. A54, 306-319. 

Figure 13 SADP in [001] orientation for (a) the sample annealed in (a) N2 (b) in 02. The patterns are at the same magnification, (c) [001] convergent beam diffraction pattern of the sample annealed in oxygen. HOLZ is arrowed.

Specimen orientation. The specimen must be oriented so that the incident electron beam is parallel to the zone axis of interest. This is done by tilting the specimen while observing the selected area (or the convergent beam) diffraction pattern. 

Figure 14 Convergent-beam diffraction pattern recorded from intermediate diffraction screen in STEM for Co-Cr-Mo alloy. Note clear dynamical structure in reflections ...

Eades, J.A. Convergent-beam diffraction. In Electron Diffraction Techniques, Cowley, J.M., Ed. Oxford University Press New York, 1992 Vol. 1, 313-359. 

The Bristol Group Convergent Beam Diffraction of Alloys Phases (Adam Hilger, UK, 1984). 

Figure 39. Deflciency HOLZ (high-order Laue zone) lines in the central disk of a convergent beam diffraction pattern of silicon [168]...

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