Bloch wave
Bloch wave
The incident plane electron-wave to a crystal cannot exist as a single plane wave but as the waves composed of the incident wave and reflected waves due to strong coupling of those waves (dynamical diffraction effect). The waves are called Bloch waves. When the incident wave and one reflected wave are considered (two-beam approximation), two Bloch waves, the linear combinations of the two plane waves, are produced in the crystal. One Bloch wave is localized on atomic columns and another Bloch wave is localized between atomic columns.
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