Abstract
The structure of saturated chlorine layer on Ag(111) has been studied with low temperature scanning tunneling microscopy and density functional theory. For the first time atomic-resolution STM images of saturated chlorine coverage have been obtained. STM images demonstrate coexistence of the domain with (3 $\ifmmode\times\else\texttimes\fi{}$ 3)-like reconstruction and numerous bright objects identified as Ag${}_{3}$Cl${}_{7}$ clusters. According to our model supported by DFT calculations, clusters are formed on the boundaries between the adjacent ($3\ifmmode\times\else\texttimes\fi{}3$) antiphase domains. These boundaries have a characteristic triangular shape and are formed by six chlorine atoms chemisorbed on the triangular silver island with local periodicity (1 $\ifmmode\times\else\texttimes\fi{}$ 1).
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