Photoemission of Electrons from Alkali and Alkaline-Earth Metal Contacts into Anthracene

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Abstract
The spectral yield for photoemission reveals the presence in the conduction band of anthracene of a broad (∼0.65 eV) continuum of allowed states followed by four narrow (≲0.1 eV) bands approximately 0.2 eV apart. The Fermi level in the alkali or alkaline-earth metal is fixed relative to the energy bands of anthracene by a large density of surface states. The mean free path for energetic electrons in anthracene is estimated as 40 Å.