- #1
antonni
- 14
- 0
Hi guys, new here.
We all know the famous "Bragg Law" and the attached schematic drawing that goes along with it of a couple of planes with a distance `d` between them. Then, a DP occurs cause of constructive interference and destructive interference which happens due to planes deep in the crystal (B.D Culity book). That holds for X-Rays.
Q: Is there, in the same time as the above, diffraction from the same plane? I mean if we look at the famous drawing and the `d` is now the interatomic distance while the `dots` are actually the scatterers of the same plane ( or a diff. plane if you change your reference frame and the `depth axis`). How it relates to the "regular" diffraction phenomena?
The reason I am asking is that I have to understand EBSD nowdays, and I want to know that is the situation for electrons, cause e's interact strongly with matter (not like X-Rays) and do not penetrate too deep and I need to understand how we get diffraction from an EBSD schematic: high tilt to the e-beam in the SEM for a good BSE yield and the kikuchi lines on the detector's screen. Everywhere I saw it is described by Bragg simple formula, but these are electrons & the under these conditions the interaction onion is nanometric! where is the deep interaction which causes destructive interference? Is it diffraction a couple of planes on the "top" ? OR DIFFRACTION FROM SAME PLANE AND THE `d` IS INTERATOMIC DISTANCE?
Will also post it in "Engineering>Materials & Chemical Engineering"
(not native English)
Than x
Anton
We all know the famous "Bragg Law" and the attached schematic drawing that goes along with it of a couple of planes with a distance `d` between them. Then, a DP occurs cause of constructive interference and destructive interference which happens due to planes deep in the crystal (B.D Culity book). That holds for X-Rays.
Q: Is there, in the same time as the above, diffraction from the same plane? I mean if we look at the famous drawing and the `d` is now the interatomic distance while the `dots` are actually the scatterers of the same plane ( or a diff. plane if you change your reference frame and the `depth axis`). How it relates to the "regular" diffraction phenomena?
The reason I am asking is that I have to understand EBSD nowdays, and I want to know that is the situation for electrons, cause e's interact strongly with matter (not like X-Rays) and do not penetrate too deep and I need to understand how we get diffraction from an EBSD schematic: high tilt to the e-beam in the SEM for a good BSE yield and the kikuchi lines on the detector's screen. Everywhere I saw it is described by Bragg simple formula, but these are electrons & the under these conditions the interaction onion is nanometric! where is the deep interaction which causes destructive interference? Is it diffraction a couple of planes on the "top" ? OR DIFFRACTION FROM SAME PLANE AND THE `d` IS INTERATOMIC DISTANCE?
Will also post it in "Engineering>Materials & Chemical Engineering"
(not native English)
Than x
Anton