Probe Shape

The shape of the e-beam when propagating through a crystal is calculated as follow:

Select the Nano-diffraction tab of the "Multislice" image calculation method.
Load the stack of super-cells (Fig. 1).
Select Coherent illumination model and Save wavefunction (Fig. 2).
Initialize the calculation (Initialize button) and define the shape of the incident e-beam probe (Fig. 3).
Start the calculation (Start button).
The nano-difraction pattern is shown in Fig. 4.
Load the stack of wavefunctions (Fig. 5).
The amplitude or phase of the probe as a function depth is shown in Fig. 6.

Figure 1 Nano-diffraction tab of the multislicer.


Figure 2a Select a coherent illumination model.	Figure 2b Probe is displayed on Phase Object Function.

Figure 3 Define the incident probe (defocus).

Figure 4 Nano-diffraction pattern.

Figure 5 Load the stack of wavefunctions.

Figure 6 Amplitude of the probe as a fucntion of specimen thickness (y-z view).