The animation starts with a longitudinal wave with a wavelength equal to the lattice parameter a. The arrow shows the direction of the k vector.
The program recognizes the following commands:
| F | highlight the front plane of atoms |
| M | highlight the middle plane of atoms |
| B | highlight the back plane of atoms |
| A | highlight none of the atoms |
| 1 | wavelength = a |
| 2 | wavelength = 2a |
| 4 | wavelength = 4a |
| X | polarization of wave in x direction (longitudinal wave) |
| Y | polarization of wave in y direction (transverse wave) |
| Z | polarization of wave in z direction (transverse wave) |
| Q | quit the program |
| ? | Help. These commands are listed. |