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じゆうでんし 自由電子
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Noun
1. free electron​Physics
Wikipedia definition
2. Free electron model​In solid-state physics, the free electron model is a simple model for the behaviour of valence electrons in a crystal structure of a metallic solid. It was developed principally by Arnold Sommerfeld who combined the classical Drude model with quantum mechanical Fermi-Dirac statistics and hence it is also known as the Drude–Sommerfeld model. The free electron Empty Lattice Approximation forms the basis of the band structure model known as nearly-free electron model.
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