title: Scanning tunneling microscopy investigation of the structure of methanethiolate on Ag(111).
abstract: Scanning tunneling microscopy (STM) has been used to investigate the structure of the ordered methanethiolate overlayer formed on Ag(111) by reaction at room temperature with dimethyl disulfide. High-resolution images show an ordered structure with three inequivalent atomic-scale protrusions within each ( radical7 x radical7)R19 degrees surface unit mesh which can be reconciled with methanethiolate species on a regular lateral submesh, similar to that proposed in the multilayer ( radical7 x radical7)R19 degrees -S sulfide phase previously reported. STM imaging during dynamic dosing also provides evidence for a significant change in the outermost layer Ag atom density, consistent with a reconstructed surface model. Possible models for this reconstruction are presented and discussed in the light of available information.
authors.affiliation: Physics Department, University of Warwick, Coventry CV4 7AL, UK.
authors.forename: Miao
authors.initials: M
authors.lastname: Yu
authors.forename: S M
authors.initials: SM
authors.lastname: Driver
authors.forename: D P
authors.initials: DP
authors.lastname: Woodruff