[3dem] RE: electron diffraction
De Carlo, Sacha
Sacha.DeCarlo at fei.com
Fri Aug 23 07:36:21 PDT 2013
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
Achtseweg Noord 5, 5651 GG Eindhoven, The Netherlands
T +31 6 10810795 E Sacha.DeCarlo[at]fei.com fei.com
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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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