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LEED CRYSTALLOGRAPHIC DETERMINATION FOR THE RESTRUCTURED SURFACE FORMED BY PHOSPHORUS BONDED AT CU(110)

TitleLEED CRYSTALLOGRAPHIC DETERMINATION FOR THE RESTRUCTURED SURFACE FORMED BY PHOSPHORUS BONDED AT CU(110)
Publication TypeJournal Article
Year of Publication1995
AuthorsLiu, W, Vu, DT, Mitchell, KAR
JournalChemical Physics
Volume198
Pagination235-243
Date PublishedSep
Type of ArticleArticle
ISBN Number0301-0104
Keywordschemisorption, CRYSTAL-STRUCTURE, ENERGY ELECTRON-DIFFRACTION, OXYGEN
Abstract

LEED crystallography is used to study the ordered ((2)(-11) (2)) surface structure formed on reacting PH3 with the Cu(110) surface followed by an anneal at 720 K. Intensity-versus-energy curves were measured with a video system for 13 diffracted beams at normal incidence, and they were analyzed with multiple-scattering calculations. The best correspondence between experimental and calculated I(E) curves indicates a new type of structural model in which a half-monolayer of P reconstructs the original metal surface, in effect by adding a quarter-monolayer of Cu atoms to form rows in the [112] direction. In this structure, each adsorbed P atom has six-fold coordination, and all Cu atoms in the top two metal layers bond to two P atoms. The average P-Cu length is 2.33 Angstrom, in reasonable correspondence with expectation from the structure of bulk Cu3P. Comparsions are made with other related systems.

URL<Go to ISI>://A1995RT46400019