Abstract
AbstractIn a previous paper the photo‐emission of electrons from evaporated Na and Cs cathodes into anthracene crystals has been studied. Using this technique the existence of an upper conduction band has been established. In this paper the photo‐emission into free electron states above the ionization level of the anthracene crystal is observed. The threshold energy of 2.72 eV can be interpreted as the sum of the vacuum work function of Na and the potential of a dipole layer formed by charge‐transfer complexes at the Na–anthracene interface, which can act as a source for electron injection after optical excitation, too. From the knowledge of this energy and the threshold energies for photo‐emission into the first and second conduction band the energy differences between the bottoms of both conduction bands and the free electron level can be deduced. Values of 1.72 and 1.27 eV, respectively, are obtained. The energetic separations to the valence band are 3.93 and 4.38 eV, respectively.
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