A loss for photoemission is a gain for Auger: Direct experimental evidence of crystal-field splitting and charge transfer in photoelectron spectroscopy

Abstract

We find a new 5 eV satellite in the Ti 1s photoelectron spectrum of the transition-metal oxide SrTiO${}_3$. This satellite appears in addition to the well-studied 13 eV structure that is typically associated with the Ti 2p core line. We give direct experimental evidence that the presence of two satellites is due to the crystal-field splitting of the metal 3d orbitals. They originate from ligand 2p t${}_{2g}$ $\to$ metal 3d t${}_{2g}$ and ligand 2p e${}_g$ $\to$ metal 3d e${}_g$ monopole charge-transfer excitations within the sudden approximation of quantum mechanics. This assignment is made by the energetics of the resonant and high-energy threshold behaviors of the Ti K-L${}_2$L${}_3$ Auger decay that follows Ti 1s photo-ionization.

4 pages, 5 figures

References in corpus (2)

• Real time cumulant approach for charge transfer satellites in x-ray photoemission spectra
• Intersite 4p-3d hybridization in cobalt oxides: a resonant x-ray emission spectroscopy study