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Bloch-wave

The Bloch-wave approach allows to calculate dynamical selected area electron diffraction patterns (SAED), convergent electron diffraction patterns (CBED and LACBED) and high resolution electron microscope images (HREM) is shown on figures 1 to 12.

The tool buttons (from left to right) allows to:

The dialog tabs are used to:

The theory behind the Bloch wave calculations is available here

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Bloch-wave display

The pane for Bloch-wave display (ZnTe [110]) is displayed in Fig. 1. The tool button makes available the sliders controling the diffraction pattern.

Figure1

Figure 1 Bloch-wave display pane (ZnTe [110]).

Figure2

Figure 2 1s state Te (ZnT [011]).

Detailed information here.


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Channeling

This pane allows to caculate how electrons channel through the crystal (Fig. 3). The imaging pane sets the number of unit cells that will be displayed either as the wavefunction (Fig. 4) or the integrated intensity as a function of crystal thickness.

Figure3

Figure 3 Channeling pane (ZnTe [110]).

Figure4

Figure 4 Wave-function (ZnTe [110]).

Detailed information here.


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CBED, LACBED and precession

This pane allows to calculate dynamical CBED, LACBED, Precession electron diffraction patterns.

Figure5

Figure 5 CBED pane (ZnTe [110]).

Figure6

Figure 6 CBED pane (ZnTe [110]).

More information here.


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HREM map

Figure7

Figure 7 HREM images map, diffraction panel (ZnTe [110]).

Figure8

Figure 8 HREM images map, map panel (ZnTe [110]).

More information here.


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Rocking curves

Rocking curves are line cut through CBED patterns (Figs. 9, 10). Rocking curves (1-D) were pretty useful to investigate crystal thickness and polarity. Nowadays with parallel calculations they are being replaced by CBED calculations that produce 2-D images (Fig. 9).

Figure9

Figure 9 Rocking curves, diffraction panel (ZnTe [110]).

Figure10

Figure 10 Rocking curves, curves panel (ZnTe [110]).

More information here.


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Tilt table

Tilt tables allow to simulate at once images under tilted illumination conditions.

Figure11

Figure 11 Tilt table setting (ZnTe [110]).

Figure12

Figure 12 Tilt table images (ZnTe [110]).

More information here.