Surface core exciton of alkali chloride film on Si(100)

Abstract

Surface core exciton has been observed in the partial-photoelectron-yield spectra in the Cl-L 2,3 region of alkali chloride (KCl and NaCl) film deposited on the Si(100) surface. Compared to the bulk core exciton peaks, the surface core exciton peaks were shifted by 0.7 eV towards lower photon energy. This may be to the change in Madelung potential at the surface. The photoelectron spectra was measured with various photon energies near the Cl-L 2,3 edge for NaCl/Si(100), and it was found that the Auger spectra drastically change in shape at eht excitation energies corresponding to the bulk and surface core excitons.