Loss for photoemission versus gain for Auger: Direct experimental evidence of crystal-field splitting and charge transfer in photoelectron spectroscopy

Woicik, J. C.; Weiland, C.; Rumaiz, A. K.

doi:10.1103/PhysRevB.91.201412

Title: Loss for photoemission versus gain for Auger: Direct experimental evidence of crystal-field splitting and charge transfer in photoelectron spectroscopy

Journal Article · Fri May 29 04:00:00 UTC 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI: https://doi.org/10.1103/PhysRevB.91.201412 · OSTI ID:1341499

Woicik, J. C. ^[1]; Weiland, C. ^[1]; Rumaiz, A. K. ^[2]

National Institute of Standards and Technology, Gaithersburg, MD (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Here, we find a 5 eV satellite in the Ti1s photoelectron spectrum of the transition-metal oxide SrTiO₃. This satellite appears in addition to the well-studied 13 eV structure that is typically associated with the Ti2p 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 2pt_{2_g} → metal3dt_{2_g} and ligand 2pe_g → metal 3de_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 TiK–L₂L₃ Auger decay that follows Ti1s photoionization.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI ID:: 1341499

Report Number(s):: BNL--108202-2015-JA

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 20 Vol. 91; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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