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In Situ X-Ray Scattering of Monolayers Adsorbed at Electrochemical Interfaces.

Published online by Cambridge University Press:  21 February 2011

Michael F. Toney  and
Owen. R Melroy
Michael F. Toney
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120-6099
Owen. R Melroy
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, CA 95120-6099
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Abstract

Surface x-ray scattering has been used to study in-situ the structure of Pb monolayers electrochemically adsorbed on Ag (111) electrodes. Pb forms an incommensurate, hexagonal two-dimensional (2D) solid, which is rotated approximately 4.5° from the substrate symmetry directions and compressed relative to bulk Pb. Between monolayer formation and bulk deposition, the Pb-Pb near neighbor distance decreases linearly with applied potential. Due to the chemical equilibrium between the Pb monolayer and the Pb in solution, the isothermal compressibility of the monolayer can be measured and is in good agreement with that calculated for a 2D non-interacting free electron gas model of the monolayer. It is observed that the intensity of surface diffraction from the Ag substrate (the Ag crystal truncation rod) decreases when the Pb monolayer is adsorbed, although the cause of this is not known.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 143: Symposium V – Synchrotron Radiation in Materials Research , 1988 , 37
Copyright
Copyright © Materials Research Society 1989

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