The Borrmann effect (or Borrmann–Campbell effect after
Gerhard Borrmann and Herbert N. Campbell) is the anomalous increase in the intensity of X-rays transmitted through a crystal when it is being set up for
Bragg reflection.
The Borrmann effect—a dramatic increase in transparency to X-ray beams—is observed when X-rays satisfying
Bragg's law
In many areas of science, Bragg's law — also known as Wulff–Bragg's condition or Laue–Bragg interference — is a special case of Laue diffraction that gives the angles for coherent scattering of waves from a large crystal lattice. It descr ...
diffract through a perfect crystal. The minimization of absorption seen in the Borrmann effect has been explained by noting that the electric field of the X-ray beam approaches zero amplitude at the crystal planes, thus avoiding the atoms.
References
*
*
* Borrmann, Gerhard; ''Über Extinktionsdiagramme von Quarz'', Physikalische Zeitschrift 42, 157–162 (1941)
''Die Absorption von Röntgenstrahlen im Fall der Interferenz'', Zeitschrift für Physik 127, 297–323 (1950)- original articles on Borrmann effect
* Campbell, Herbert N.
''X-Ray Absorption in a Crystal Set at the Bragg Angle'' Journal of Applied Physics 22, 1139 (1951)
*
von Laue, Max''Die Absorption der Röntgenstrahlen in Kristallen im Interferenzfall'', Acta Crystallographica 2, 106–113 (1949)- original explanation of Borrmann effect
X-ray crystallography
{{Crystallography-stub