Interactive Tutorial about Diffraction
Interactive example : Bragg's law
This example simulates the interference between two waves scattered
by atoms located on two parallel layers. It is an interactive version
of the graph that is used in many textbooks to explain Bragg's law.
The atom in the lower plane is fixed at the x-coordinate zero, the atom in the upper plane may be located at a different x-coordinate.
The incomming plane wave is scattered by each atom individually. The two scattered waves are plotted using the Bragg angle THETA that you provide. The resulting wave is the sum of these two waves and plotted as green wave.
As in the previous example, the oszillations are plotted normal to the wave vectors. Ideally these shoud be plotted normal to your computer screen, yet we still have to wait for proper holography to work... I'll beam it up once that works...
Start exploring and try to answer the questions below: For your first trials you should keep all parameters at their default values and just change the Bragg angle.
|© Th. Proffen and R.B. Neder, 2003|