In Situ Grazing Incidence X-Ray Diffraction Study of Electrochemically Deposited Pb Monolayer on Ag(111),
Interim technical rept.,
PUERTO RICO UNIV RIO PIEDRAS DEPT OF PHYSICS
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We report here the first in-situ X-ray diffraction measurements from a monolayer adsorbed at a metal-liquid interface. Diffraction peaks were observed from a monolayer of lead electrochemically deposited onto a silver 111 surface immersed in aqueous electrolyte. Grazing incidence geometry was used. The lead was found to order into a closed packed hexagonal structure, compressed 1.2 from bulk lead. The first order diffraction peak was 0.037 A1 broad in the radial and azimuthal directions, indicating that even in an aqueous environment the Pb monolayer forms a well ordered two dimensional solid. A rotational epitaxy angle angle between the Pb and Ag surface lattices of 4.4 was observed. Keywords X ray Electrode Interface Structure.
- Physical Chemistry