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Bragg diffraction  How to make sense of it ? 
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#1
Jan2514, 10:24 AM

P: 14

Is there a way to make sense of Diffraction of X Rays without taking recourse to oversimplified concepts like "Reflection of X Rays by parallel planes" which is generally the explanation in most basic physics books. It's been a couple years since I first studied it and i continue to get confused by assertions like reflecting of Photons by atoms. Online sources are also full of it :
http://wwwoutreach.phy.cam.ac.uk/ca...raction7_1.htm OR http://chemwiki.ucdavis.edu/Analytic...ragg's_Law 


#2
Jan2514, 10:44 AM

Sci Advisor
Thanks
PF Gold
P: 1,908

You can start with the Laue equations, which are derived from interference principles used in gratings, and derive the Bragg equation from them: http://www.phys.utk.edu/courses/Fall.../chapter1c.pdf
Or you can start with the fully quantum mechanical Bloch theorem and derive the Bragg equation: http://www.unituebingen.de/meso/sss...helectrons.pdf But the Bragg equation is very simple, and very accurate, so I have used it extensively in my electron diffraction work. 


#3
Jan2614, 06:00 AM

P: 14

I get that. But, is there a way to explain things without relying on mathematical formalism. I mean a general discussion on the physical mechanism.



#4
Jan2614, 03:33 PM

Sci Advisor
Thanks
PF Gold
P: 1,908

Bragg diffraction  How to make sense of it ?
Read chapter two of this dissertation: http://hdl.handle.net/2027.42/63758
It starts with crystal theory, atomic scattering, and elastic scattering from crystals ... in short, a derivation of diffraction patterns starting from scratch. 


#5
Jan2714, 10:11 AM

P: 669

This article by P. P. Ewald, one of the founding fathers of xray diffraction, give an excellent overview without excessive math.
http://rmp.aps.org/abstract/RMP/v37/i1/p46_1 


#6
Feb514, 11:13 PM

P: 14




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