At the bottom of the SAED image, there is a scale marked 2 1/nm, can someone just clarify what is it, why 2 1/nm marked, and how it is used while calculation??? I have attached the reference image.
Hello Indra,
I am agree with Matgias. You can go with. Still if you have any question do not hesitate to ask. All the best.
Regards,
Amol
Agreed with Mathias Schröder,
this scale helps in indexing the SAED pattern.
you may refer any reference book on TEM for SAED pattern analysis.
Hi Mathias,
image b and c are obtained from SAED (selected area electron diffraction) experiments, performed with a TEM. In SAED experiments, electron diffraction pattern are obtained from the area selected by an aperture in the image plane of the microscope. In a TEM you can optain both: imaging and diffraction data.
Kind regards,
Levin
What Schroder, wrote, I slightly differ. Most part of the answer is correct.
"b and c are not from TEM measurments"....The figures in b and c are from TEM in SAD mode (diffraction). That comes, while we take snap, because to index the rings and the spots in reciprocal lattice, we need to know the Camera Constant and that number helps to calculate the camera constant...
Hope, with this introduction, you have to read about diffraction and reciprocal lattice and Ewald Spare and crystallography.
Refer to the book "Elements of x-ray diffraction - 3rd Edition" by B D Cullity and S R Stock, or any book on diffraction and you will get the answer. Read the section on reciprocal lattice.
Image a is a typical TEM image while images b and c are obtained in the diffraction mode using a SAED aperture. In image a the scale bar shows the length scale in the real space whereas similar information is given in the diffraction patterns, but in a reciprocal space.
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