Resonant Photoemission from Si

Abstract
Anomalous evolution of the silicon valence-band photoemission spectra is observed in the photon energy region from the 2p core-excitation threshold to about 3 eV above the threshold. The 3p-like topmost emission band shows a Fano-type resonance, and stronger intensity enhancement is observed in the deeper binding-energy region around 7.6 eV. The present results show the existence of a decaying localized core exciton at the 2p core-excitation threshold.