The aperture window is shown in Fig. 1. Its toolbar contains tool buttons to:
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The aperture window is shown in Fig. 1. Its toolbar contains tool buttons to:
This window sets the size of the objective aperture (OA) and the (LACBED/DF) aperture. The OA and LACBED/DF apertures are located in the diffraction and image plane of the objective lens respectively.
It also sets the position of the OA and LACBED/DF apertures as well as the tilt of the incident illumination. Such a tilt corresponds to a translation of the optical axis origin with respect to the diffraction pattern (Fig. 2 ).
By default the OA is centered on the (0,0,0) reflection. It can be moved by clicking on a reflection (Fig. 3a) or by dragging the green cross (Fig. 3b).
The Stretch radiobutton can be used to display HRTEM images with maximum contrast (when the OA does not include the transmitted beam).
The LACBED/DF aperture is by default centered on the (0, 0, 0) reflection (Fig. 6). It can be moved by clicking on a reflection or by dragging the green cross. The LACBED/DF also selects the reflection during LACBED calculations.