I have done HRTEM imaging and Surface area electron diffraction (SAED) analysis of my nanoparticles, the results are fine, but the scale in SAED diffraction image is 10.0 1/Gm, not in nm. Does anyone know about it? How to convert it in nanoscale?
It should be the point resolution: 1/Gm = 1/109m which is nm-1.
(If giga is taken as "gigameter" into account).
I've never seen that notation before, but I'm guessing that whoever wrote the software for that calibration was confused, and was thinking something like "Giga inverse meters," which would be the same thing as inverse nanometers. If so, it's extremely nonstandard, not to mention apparently incorrectly written, since it's definitely not an inverse gigameter!
I think to be certain you should look at a sample with a known diffraction pattern (polycrystalline aluminum, for example) and verify that interpreting that as inverse nanometers makes sense.
Also be aware that some people will calibrate diffraction patterns as cycles per nanometer, while some will calibrate them as radians per nanometer, and both are typically notated as "1/nm" or "nm-1". Surprisingly few people seem to be aware that both conventions are in common use in different fields! So if it's not coming out, try putting in a factor of 2pi.
I think it's gigameter too, I'll do the analysis and will post if it works or not. Thank you for prompt reply, I never thought I will get an answer so quickly.
I have never seen this type of scale bar in SAED pattern. I think it may be a mistake, in order to quick checked this try one known sample and see the difference. Anyway you did it yourself or some other operator acquired these SAED. Try to check it once again.
maybe the calibration is not in inverse Space, but 1/Gm = nm, but it is stil nonsense
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