TEM and STEM

[Alison Cowan]

Dear QSTEM users,

I have been running simulations using a BaTiO3 structure but have noticed that when I run a TEM simulation and then a STEM simulation, both images produced are the same, which seems a bit odd. Any ideas why this might be? I've attached both images for you to take a look at.

Thanks

[Christoph T. Koch]

Dear Alison,

 

I suggest to save the output of your simulations for STEM and TEM in different folders.

 

The STEM images are all called detector#1_#2.img, where the first number is the number of the detector as you have defined it, and the second number is the thickness (the highest number refers to the full specimen thickness).  The files mulswav_#1_#2.img are the wave functions that correspond to each of the probe positions for the last TDS run that you have done.  Depending on your save level you may also find the TDS-averaded diffraction patterns in that folde.  These are best displayed on a log scale, while a linear scale should be selected for images and wave functions.

 

The TEM simulation does not really produce an image, what what you are expected to use are the wave functions.  From those you can then compute different images using the button ‘Simulate images from wave’ in qstem, or by running the program imageSim.

The wave functions produced in TEM mode should be called wave_#1.img, or wave_#1_#2.img, in case you did not turn off TDS.  I suggest to read this tutorial for simulating an image from the wave function: http://elim.physik.uni-ulm.de/wp-content/uploads/2012/08/Dudeck09_ImageSim_tutorial-1.pdf

 

With best regards,

Christoph.

 

Christoph Koch

Carl-Zeiss Professur für Elektronen- und Ionenmikroskopie

Institut für Experimentelle Physik

Universität Ulm

Albert-Einstein-Allee 11

D-89081 Ulm

Tel: +49 731 50 36400

Mobil: +49 152 22543142

Url: http://elim.physik.uni-ulm.de

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