Scanning direction

[Sebastian Calderon]

Dear all,

I have been working with the diffraction patterns for each probe position in STEM simulation. However, I am not sure what is the scanning direction that the software uses to save the files "diffAvg_0_0.img". I have run some tests and I concluded that the files should correspond to the pixels shown in the image:

Could anyone confirm me if this is correct?

Thank you in advance,

Sebastian Calderon,

Research Fellow

International Iberian Nanotechnology Laboratory

[Christoph Koch]

Hi Sebastian,

 

if you are talking about the image display via qstem’s showimage you are correct, the (0,0) image is at the bottom left, and the first axis is the y-axis, while the second axis is the x-axis.

As you can see from the screenshot below, Displaying the very same image in DM (import .img images using the readimage menu item from the FRWRTools plugin), the y-axis is flipped, so that the (0,0) position is at the top left.

 

With best regards,

Christoph.

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[Sebastian Calderon]

Dear Prof. Koch

Thank you for your answer, it was very useful. Could you please inform me if there is any way to set up a segmented detector for the STEM simulations?

Best regards,

[Christoph Koch]

Hi Sebastian,

 

There is currently no segmented detector implemented, but with a high enough save level, all the local diffraction patterns are saved, so one can read those in again and integrate those pixels that you are interested in after the simulation is done. In principle, the saved diffraction patterns correspond already to a segmented/pixelated detector.

 

Best regards,

[Sebastian Calderon]

Dear Prof. Koch

Thank you again for your answer. In fact, I am generating the images from the diffraction patterns and it is working.

Best regards,