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dispersion surface

dispersion surface

When the electron waves inside the crystal are considered by the two-beam dynamical theory, the incident and reflected waves change their wave numbers near the Bragg position. At this event, a dispersion sphere splits to produce new two surfaces. These surfaces are termed "dispersion surfaces." Near the Bragg position, the incident and reflected waves do not exist independently, but exist as two Bloch waves that are their linear combinations.

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