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HamishGBrown / MuSTEM

Open source version of the MuSTEM multislice electron microscopy simulation code, developed at the University of Melbourne.
http://tcmp.ph.unimelb.edu.au/mustem/muSTEM.html
GNU General Public License v3.0
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Question about dimensions of simulated CBED #25

Open shz224 opened 4 years ago

shz224 commented 4 years ago

I wonder how the simulated CBED image size (Nx and Ny) is determined in muSTEM. Thanks in advance.

HamishGBrown commented 4 years ago

This should be your simulation grid pixel size (whatever you specified in your input) but cropped to the multislice band-width limit which is 2/3rds of your grid size, ie. 1024 x 1024 becomes 683 x 683 and 512 x 512 becomes 341 x 341. This is done because reciprocal space values outside of this range are zeroed in the multislice routine so the output is cropped to remove this zeros and save you hard disk space. For an explanation as to why we use band-width limiting in multislice see Kirkland's textbook "Advanced computing in electron microscopy".

shz224 commented 3 years ago

I got it, thanks a lot.