On the Photoelectric Emission and Energy Structure of BaO

Abstract

Spectral distributions of the photoelectric yield and energy distributions of the photoelectrons were obtained for BaO surfaces made in widely different ways. A small and variable yield for $h\nu <5\mathrm{}$ ev was attributed to unidentified imperfections. At the optical absorption edge, there was an effect much like the excitoninduced photoemission in alkali halides. At $h\nu \sim 5$ ev, an abrupt rise in the yield was ascribed to emission from an occupied band of electron states with an upper edge 5 ev below the vacuum level. Energy distributions were consistent with this interpretation.