What is ENERGY LEVELS?

1 In semiconductors, a donor level is an intermediate level close to the conduction band; being filled at absolute zero, electrons in this level can acquire energies corresponding to the conduction level at other temperatures. An acceptor level is an intermediate level close to the normal band, but empty at absolute zero; electrons corresponding to the normal band can acquire energies corresponding to the intermediate level at other temperatures. See Fermi level. 2 Electron energies in atoms are limited to a fixed range of values termed permitted energy levels, and represented by horizontal lines drawn against a vertical energy scale. Cf band theory of solids. See eigenvalues. Schrodinger equation


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