Accession Number : ADA181063

Title :   In Situ Grazing Incidence X-Ray Diffraction Study of Electrochemically Deposited Pb Monolayer on Ag(111),

Descriptive Note : Interim technical rept.,

Corporate Author : PUERTO RICO UNIV RIO PIEDRAS DEPT OF PHYSICS

Personal Author(s) : Samant,Mahesh G ; Toney,Michael F ; Borges,Gary L ; Blum,Lesser ; Melroy,Owen R

PDF Url : ADA181063

Report Date : 12 May 1987

Pagination or Media Count : 19

Abstract : 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 A(1) 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.

Descriptors :   *DEPOSITION, *LEAD(METAL), *SILVER, ELECTROLYTES, LIQUIDS, LAYERS, GEOMETRY, GRAZING, AZIMUTH, ORIENTATION(DIRECTION), DIFFRACTION, PEAK VALUES, X RAY DIFFRACTION, ANGLES, EPITAXIAL GROWTH, ROTATION

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE