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Paschen may refer to: Friedrich Paschen (1865–1947), German physicist Paschen (crater), a lunar crater on the far side of the Moon Paschen-Back effect, the splitting of atomic energy levels in the presence of a strong magnetic field Paschen series, a Hydrogen spectral series in the infrared band Paschen's law, an equation that gives the breakdown voltage, that is the voltage necessary to start a discharge or electric arc, between two electrodes in a gas as a function of pressure and gap length