Photoemission of Electrons from Alkali and Alkaline Earth Metals into Anthracene Crystals

摘要: Abstract We have found that photoemission of electrons from cesium, sodium, calcium, and magnesium into anthracene crystals can be observed. This implies the interfacial complex layers are thin enough not to modify energy distribution photoexcited passing metal crystal. The main property is related surface states which able trap if separation Fermi level edge lowest conduction band lower than trapping energy. A maximum depth 1.30 ± 0.2 eV estimated. occupation therefore depends on work function contact. These charges threshold energies for They released optically thus giving rise a component photoinjection current displaying spectral response curve identical with optical absorption mononegative ion. spect...