Bragg diffraction - How to make sense of it ??


by svrphy
Tags: bragg, bragg's law, diffraction, sense, x ray diffraction
svrphy
svrphy is offline
#1
Jan25-14, 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://www-outreach.phy.cam.ac.uk/ca...raction7_1.htm
OR
http://chemwiki.ucdavis.edu/Analytic...ragg's_Law
Phys.Org News Partner Physics news on Phys.org
Modification of structural composite materials to create tailored lenses
Novel technique opens door to better solar cells
Probing metal solidification nondestructively
UltrafastPED
UltrafastPED is offline
#2
Jan25-14, 10:44 AM
Thanks
P: 1,279
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.uni-tuebingen.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.
svrphy
svrphy is offline
#3
Jan26-14, 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.

UltrafastPED
UltrafastPED is offline
#4
Jan26-14, 03:33 PM
Thanks
P: 1,279

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.
M Quack
M Quack is offline
#5
Jan27-14, 10:11 AM
P: 635
This article by P. P. Ewald, one of the founding fathers of x-ray diffraction, give an excellent overview without excessive math.

http://rmp.aps.org/abstract/RMP/v37/i1/p46_1
svrphy
svrphy is offline
#6
Feb5-14, 11:13 PM
P: 14
Quote Quote by M Quack View Post
This article by P. P. Ewald, one of the founding fathers of x-ray diffraction, give an excellent overview without excessive math.

http://rmp.aps.org/abstract/RMP/v37/i1/p46_1
Thanks for the link. If you have access, could you pls give me the pdf ?


Register to reply

Related Discussions
X-ray Diffraction and Bragg's Law Advanced Physics Homework 0
Bragg Diffraction Help Introductory Physics Homework 1
Bragg Diffraction Physics Learning Materials 0
Bragg diffraction Advanced Physics Homework 5
Bragg's Diffraction Introductory Physics Homework 0