In this way it is possible to probe the electron momentum density of a solid and determine the Fermi surface. Since a positron in a solid will thermalize prior to annihilation, the annihilation radiation carries the information about the electron momentum. With it is also possible to determine the Fermi surface as the annihilation process conserves the momentum of the initial particle. Derevyannie fermi chertezhi3940891. The corresponding experimental technique is called (ACAR) as it measures the angular deviation from 000000000♠180 degree of both annihilation quanta.

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