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Author Schuster, R. ♦ Robinson, I. K. ♦ Kuhnke, K. ♦ Ferrer, S. ♦ Alvarez, J. ♦ Kern, K.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ THIN FILMS ♦ PHASE TRANSFORMATIONS ♦ PALLADIUM ♦ X-RAY DIFFRACTION ♦ CARBON MONOXIDE ♦ CHEMISORPTION ♦ SORPTIVE PROPERTIES ♦ DOMAIN WALLS ♦ TEMPERATURE RANGE 273-400 K ♦ ADSORBATES ♦ CRITICAL EXPONENTS
Abstract X-ray-diffraction measurements have been carried out for a monolayer of CO on the Pd(100) surface. Because of equilibrium with the gas phase, at constant pressure a series of structures is formed with varying temperature (varying coverage). One structure at 350 K selected for crystallographic analysis, is found to be a commensurate lattice with {ital p}2{ital gg} symmetry of CO molecules bound in substrate-bridge sites. The vibration amplitudes of the molecules are substantially larger in-plane than out-of-plane. Upon cooling, a phase transition is crossed beyond which the structure becomes incommensurate. Symmetry considerations and the measured exponent of 0.5{plus_minus}0.05 establish this transition to be in the Pokrovsky-Talapov universality class. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-12-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 23


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