Rotating Crystal Method for 2D Lattices Using Ewald's Circle

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Use the "lattice" setter bar to select from the five different types of 2D lattices. The wavelengths that satisfy Bragg's law are associated with specific radii of the Ewald's circle, which can be selected through the "Ewald radius" and "θ (rad)" setter bars.

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In order to take all possible geometric cases into consideration, different options have been chosen for each crystal lattice, which can be selected through the "cases" setter bar.

Two boxes show the vectors that generate the direct lattice and the reciprocal lattice; to highlight the crystal rotation, the fixed vectors are shown in red and the rotating vectors are shown in black. Further, the rotation is highlighted by orange dashed arcs.

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Contributed by: D. Meliga and S. Z. Lavagnino (April 2017)
Additional contribution by: E. Zangrando
Open content licensed under CC BY-NC-SA


Snapshots


Details

Snapshot 1: no diffraction; on the direct lattice this becomes clear through the representation of a single vertical line

Reference

[1] C. Kittel, Introduction to Solid State Physics, 3rd ed., New York: Wiley, 1966.



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