INTERFACIAL STRUCTURE OF IODINE ELECTRODEPOSITED ON AU(111) - STUDIESBY LEED AND IN-SITU STM

Iodine adlayers formed on Au(111) in aqueous KI solution have been stu died by ex situ Auger electron spectroscopy (AES), low-energy electron diffraction (LEED) and in situ scanning tunneling microscopy (STM). T he LEED patterns are described as c(p X root 3R - 30 degrees) where p decreases continuously with increasing emersion potential. By in situ STM, a series of rotated hexagonal structures was observed at positive potentials in addition to the c(p X root 3R - 30 degrees) structures. This rotated hexagonal adlattice was also compressed with increasing electrode potential. These results in general confirm the phenomenon o f electrocompression of the iodine adlayer on Au(111) observed by in s itu surface X-ray scattering.