Andy Buffler, UCT Physics: Slides from colloquium given on 25 ...
Andy Buffler, UCT Physics: Slides from colloquium given on 25 ...
Andy Buffler, UCT Physics: Slides from colloquium given on 25 ...
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“Laue method” ...<br />
Use an X-ray beam having a<br />
c<strong>on</strong>tinuum of wavelengths<br />
... which are reflected off<br />
the crystal <strong>on</strong>to a<br />
photographic plate.<br />
Spots are produced for<br />
different wavelengths that<br />
satisfy the reflecti<strong>on</strong><br />
c<strong>on</strong>diti<strong>on</strong> n λ = d sin θ.<br />
(θ fixed, λ variable)<br />
Spots <strong>on</strong> this ellipse<br />
produced <str<strong>on</strong>g>from</str<strong>on</strong>g><br />
scattering of the same<br />
wavelength <str<strong>on</strong>g>from</str<strong>on</strong>g><br />
planes bel<strong>on</strong>ging to<br />
the same z<strong>on</strong>e<br />
Experimentally easy ...<br />
... but can be hard to<br />
interpret photos.<br />
A representati<strong>on</strong> of a Laue photograph of a<br />
simple cubic crystal, produced with the X-ray<br />
beam perpendicular to the cube face.
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