Evidence for three surface components in the 3d core-level photoemission spectra of Ge(100)-(2×1) surface

A. Goldoni, S. Modesti, V. R. Dhanak, M. Sancrotti, and A. Santoni
Phys. Rev. B 54, 11340 – Published 15 October 1996
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Abstract

The 3d surface core-level shifts of the clean Ge(100)(2×1) surface have been investigated at 300 K by photoemission. A previously unobserved (to our knowledge) shifted component at about +0.19 eV relative to the bulk emission has been clearly identified and associated with dimer down-atom emission. The binding energy difference of 0.72 eV between dimer down-atom and dimer up-atom 3d core levels, consistent with a charge transfer similar to that occurring in the Si(100)-(2×1) surface, supports the so-called ionic model of the Ge(100)-(2×1) buckled-dimer reconstruction. © 1996 The American Physical Society.

  • Received 3 June 1996

DOI:https://doi.org/10.1103/PhysRevB.54.11340

©1996 American Physical Society

Authors & Affiliations

A. Goldoni and S. Modesti

  • Laboratorio Tecnologie Avanzate Superfici e Catalisi (TASC)–Istituto Nazionale per la Fisica della Materia,
  • Padriciano 99, I-34012 Trieste, Italy
  • Dipartimento di Fisica, Universitá di Trieste, Via Valerio 2, I-34100 Trieste, Italy

V. R. Dhanak

  • Interdisciplinary Research Centre in Surface Science, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, United Kingdom

M. Sancrotti

  • Laboratorio Tecnologie Avanzate Superfici e Catalisi (TASC)–Istituto Nazionale per la Fisica della Materia, Padriciano 99, I-34012 Trieste, Italy

A. Santoni

  • Ente Nazionale per l'Euetgia Atteruativa, Settore Nuovi Materiali, Cassella Postale 2400, I-00100 Roma, Italy

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Vol. 54, Iss. 16 — 15 October 1996

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