Set wave-function

This frame allows to define the wave function or nanoprobe at the specimen top. Aberrations up to order 8 can be set either using sliders or text fields. The coherence tab allows to set the energy spread of the electrons as well as the lens and current stability.

Figure 1 Set wave-function or nano probe.

The defocus value can be set using the up and down arrow keys when the mouse is placed in the intensity drawing of the Microscope tab. This tab contains two sets of controls for adjusting the aperture diameter, the chromatic aberrion (W₀₀) and the virtual source size and the thermal magnetic noise.

Figure 2 Set defocus using a transfer function plot (intensity).

When a uniform illumination is selected (Fig. 4), the beam-half convergence sets the size of the probe.

Figure 3 Set the probe size using the SAED pattern.

A uniform illumination for CBED or nanodiffraction is selected using the Imaging tab of the Nano-diffraction calculation.

Figure 4 Selection of a uniform illumination for CBED or nano-CBED calculation.