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Author Tian, Z. ♦ Dharma-wardana, M. W. ♦ Lu, Z. H. ♦ Cao, R. ♦ Lewis, L. J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ INDIUM PHOSPHIDES ♦ ANNEALING ♦ CHEMICAL BONDS ♦ SURFACES ♦ PHOTOELECTRON SPECTROSCOPY ♦ PHOTOEMISSION ♦ SULFUR ♦ PASSIVATION ♦ TEMPERATURE RANGE 0400-1000 K
Abstract Core-level photoemission spectroscopy and theoretical predictions of structure and spectra are used to study the fully S-covered InP(001) surface and its evolution during annealing. The theory predicts a number of stable structures besides the lowest-energy ground state which is the fully S-covered (2{times}2)-reconstructed structure, where the surface has two types of S atoms. On annealing, a fascinating sequence of structures unfolds from the fully S-covered ground state as the other stable structures become energetically accessible. The surface S atoms exchange with bulk P atoms on annealing, forming new strong S{endash}P bonds while dissociating preexisting S{endash}S dimers. The S{endash}P bonds are tilted with the P atoms just above the surface and there is only one type of S atom in the structure. The measured excitation energies and spectra agree with theoretical predictions of the core-level spectra for the (2{times}2) reconstruction and its evolution to partial S coverages. We conclude that the annealed surface around 700 K is most likely to be a (2{times}2) reconstructed surface with the surface cell containing two S{endash}P bonds, with just one type of S atom. {copyright} {ital 1997} {ital The American Physical Society}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1997-02-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 55
Issue Number 8


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