Interactive Tutorial about Diffraction
Interactive example: Displacement waves

Diffuse scattering
Thermal I
Thermal II
Occupational I
Occupational II
Longitudinal waves
Transversal waves
Short range order
Stacking faults

Interactive examples
Displacement waves
Short range order
Stacking faults

Goto
Contents

 This interactive example allows one to create harmonic displacement waves in a mono-atomic crystal. The crystal size is 40x40 unit cells with a lattice parameter of a=5A. The parameters defining the wave are the propagation direction (u,v,0), direction of the displacement (x,y,0), the wavelength, amplitude and phase of the wave. All parameters are specified using the input fields on the right. Additionally one can choose to calculate the resulting X-ray or neutron scattering.

Here are a few questions to explore:

  1. What is the influence of the propagation and displacement direction on the diffraction pattern ?
  2. Why do certain Bragg peaks show no satellites ?
  3. What is the effect of wavelength, amplitude and phase on the resulting diffraction pattern ?

  4. Simulate a longitudinal and transversal mode !

Once you are done, click here to verify your answers.

© Th. Proffen and R.B. Neder, 2003