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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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Which part of a sample interacts with the beam first? #8

Open thomasaarholt opened 5 years ago

thomasaarholt commented 5 years ago

Hi Hamish,

If a "pretend" sample has two atoms, A and B, with z = 0 and 5 Å respectively, which atom will be hit by the beam first?

Another way of asking the same question is, "is the sample sat with the z-axis increasing towards the electron gun, or increasing away from the gun"?

Stealing @cophus excellent image from prism-em/prismatic#33: image

HamishGBrown commented 5 years ago

Hi Thomas,

Thanks for your question, beam propagation is in the direction of increasing z. So the atom at z=0 will be hit first.

Cheers,

Hamish

On Wed, Nov 14, 2018, 04:38 Thomas Aarholt <notifications@github.com wrote:

Hi Hamish,

If a "pretend" sample has two atoms, A and B, with z = 0 and 5 Å respectively, which atom will be hit by the beam first?

Another way of asking the same question is, "is the sample sat with the z-axis increasing towards the electron gun, or increasing away from the gun"?

Stealing @cophus https://github.com/cophus excellent image from prism-em/prismatic#33 https://github.com/prism-em/prismatic/issues/33: [image: image] https://user-images.githubusercontent.com/2721423/48470457-c56a1b00-e7f1-11e8-8559-41141bb9e05b.png

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