Module 5 : MODERN PHYSICS
Lecture 26 : Wave Nature of Particle - the de Broglie Hypothesis
Electron Diffraction from a Crystal
In case of Ni crystals, the interplane separation $ d=0.215$ nm, so that one expects Bragg condition to be satisfied for first order ($ n=1$) for
 
$\displaystyle \sin\theta = \frac{\lambda}{2d} = \frac{0.167}{0.430} = 0.39$
  i.e. for $ \theta = 25^\circ$. Thus we expect a strong interference effect for scattering angle $ \phi = 2\theta = 50^\circ$.
 
\includegraphics{fig4.16.eps}
   
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