3.2 Single Slit Diffraction
There are many other examples of diffraction. The picture below shows diffraction from a single slit
where waves from different parts of the slit interfere with each other. To get the field at some point
on the detection screen, one should integrate over the slit.
- See Example 3.6.2: Derive the location of the nodes in the diffraction pattern from one slit of
widtha. Now try to compute the intensity distribution for single slit diffraction.*
3.3 Diffraction from Crystals
Electron waves were first demonstrated by measuring diffraction from crystals. Davison
and Germer observed diffraction of electrons from a Nickel crystal in 1928. They varied the electron
energy to measure the electron wavelength, agreeing well with thedeBroglie expectation.
First we see diffraction from asingle crystal.
Diffraction offpolycrystalline materialgives concentric rings instead of spots.