Site-specific ­­surface atom valence band of Pt monolayer on SrTiO<sub>3</sub> v­ia X-ray standing wave excited photoelectron emission

ORAL

Abstract

X-ray standing wave (XSW) excited photoelectron emission was used to measure the site-specific valence band (VB) for ½ monolayer (ML) Pt grown on a SrTiO3 (001) surface. The XSW induced modulations in the core level (CL) and VB photoemission from the surface and substrate atoms were monitored for three hkl substrate Bragg reflections. The XSW CL analysis shows the Pt to have an fcc-like cube-on-cube epitaxy with the substrate. The XSW VB information compares well to a density functional theory calculated partial density of states from the surface and substrate atoms. Overall, this work represents a novel method for determining the contribution to the density of states by valence electrons from specific atomic surface sites.

*This work was primarily supported by the Institute of Catalysis in Energy Processes with DOE grant number DE-FG02-03ER15457. We thank D. Bruce Buchholz for help in using the PLD Facility supported by the NU-MRSEC (NSF-DMR-1720139). Preliminary measurements were made at DND-CAT at the Advanced Photon Source (APS) supported by DuPont, Northwestern University (NU), and Dow Chemical. Argonne National Lab is supported by DOE Grant No. DE-AC02-06CH11357. This work made use of the XRD, PLD, and Keck-II facilities at NU supported by the MRSEC program of the (NSF DMR-1720139), Keck Foundation, State of Illinois, and the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205).

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Presenters

  • Yanna Chen

    • Northwestern University

Authors

  • Yanna Chen

    • Northwestern University

  • Leighton O Jones

    • Department of Chemistry, Northwestern University
    • Northwestern University

  • Tien-Lin Lee

    • Diamond Light Source
    • Diamond Light Source, Ltd., Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
    • Diamong Light Source

  • Anusheela Das

    • Northwestern University

  • Martin A Mosquera

    • Montana State University
    • University of Montanna

  • Denis T Keane

    • Department of Materials Science and Engineering, Northwestern University

  • George C Schatz

    • Northwestern University

  • Michael J Bedzyk

    • Northwestern University
    • Department of Physics and Astronomy, Department of Materials Science and Engineering, Northwestern University