Electron energy levels

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Bernhard, John, Ambrosio Rouse, Edward Sosa, Bruce Gnade, David Golden, Babu Chalamala, Sanjeev Aggarwal, and Ramamoorthy Ramesh. "Field emission energy distribution and current-voltage characteristics using single tip gated diodes." Materials Research Society Symposium - Proceedings. Vol. 558. Materials Research Society, Warrendale, PA, United States, 2000. 85–90.