x-rays: explain diffraction vs coherent scatter

Rainer lebert at ilt.fhg.de
Fri Sep 1 16:17:36 EST 2000


Still Rayleigh is the origin of Bragg. The first is the one-photon
one-atom interaction the second the experiment with an entity of photons
interacting with an entity of atoms. You get Bragg reflexes when the
atoms are ordered. Otherwise you get kind of specles.

Rainer


In article <39AE8396.15629746 at nwu.edu>,
  L-marks at nwu.edu wrote:
> While it is true that there is no difference between Rayleigh and
Bragg
> scattering in many respects, this is only part of the answer. Bragg
> diffraction
> as used for x-ray diffraction refers primarily to the case when the
wave
> scattered from different regions add coherently to give a large nett
> intensity.
> Rayleigh scattering is, I think, more for the case when the scattering
> from different regions adds incoherently. A loose analogy would be to
> compare Rayleigh scattering to what one has from an amorphous
material,
> versus Bragg diffraction from a crystal.
>
> --
> Laurence Marks
> Department of Materials Science and Engineering
> Northwestern University
> fax: (847) 491-7820
> mailto:L-marks at northwestern.edu
> http://www.numis.nwu.edu
>
>

--
Platzegel 21
B-4721 Kelmis
Belgium


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