Answers are grounded in this paper and cite their sources.
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.
No takes yet. Share an insight, caveat, or question.
Kobayashi et al. (1983) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: