Conduction-Band Structure in Anthracene Determined by Photoemission

The structure of the conduction-band system of crystalline anthracene has been investigated by means of electron photoemission from negative anthracene ions formed by reaction with K and Na. A sharp emission threshold is found at 0.79 ±{} 0.01 eV. The lowest conduction band is less than 0.03 eV wide in agreement with the calculated value. A second conduction band, 0.3 eV wide, is also found, separated from the lower one by less than 0.05 eV.