[3dem] RE: electron diffraction

[De Carlo, Sacha]

Sorry Philip,

A TEM has a projection lens system, thus if you do not specify the camera length, one cannot answer your question.

Best regards,
Sacha



Sacha De Carlo, PhD | Sr. Research Scientist

FEI
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-----Original Message-----
From: 3dem-bounces at ncmir.ucsd.edu [mailto:3dem-bounces at ncmir.ucsd.edu] On Behalf Of Philip Köck
Sent: Friday, August 23, 2013 16:18
To: microscopy at microscopy.com; 3dem at ncmir.ucsd.edu
Subject: [3dem] electron diffraction

Hi everybody,

I'm looking for a simple estimation that I can't find in any textbook I've looked in, nor on the internet.
I wonder if anybody can help me.

If I put a diffraction grating with spacing 1 Angstrom into the specimen holder and record an image of it.
At what distance from the optical axis will the corresponding diffraction spot (for 1 Angstrom spacing) appear in the back focal plane of the objective lens.

Assume a TEM with 200 kV and a twin lens, one that's typically used for protein structure determination.

Thanks,

Philip
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