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{{Electronic structure methods}}
The '''Empty Lattice Approximation''' is a theoretical [[electronic band structure]] model in which the '''potential''' is defined not more precisely than '''periodic''' and '''weak'''. The Empty Lattice Approximation describes a number of properties of energy dispersion relations of non-interacting [[Free electron model|'''free electrons''']] that move through a '''[[crystal structure|crystal lattice]]'''. The energy of the electrons in the "empty lattice" is the same as the energy of free electrons. The model is useful because it clearly illustrates a number of
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