Physics – Condensed Matter
Scientific paper
2003-08-28
Physics
Condensed Matter
13 pages, 3 figures, pdf, submitted to J. Phys. Chem B as a Letter; removed reference and changed content
Scientific paper
The formation of ordered phases of dimethyl-disulfide on the Au(111) surface has been investigated by means of Low-Energy Electron Diffraction (LEED), X-ray Photoemission Spectroscopy (XPS), and state-of-the-art Density Functional Theory (DFT) periodic supercell calculations. The LEED diffraction pattern, obtained after a production method that includes a two-step dosing and prolonged post-deposition annealing, unambiguously corresponds to a novel phase that consists of (3x4) domains coexisting with the as-deposited (sqrt3xsqrt3 )R30 structure. XPS measurements indicate that the coverage of the new (3x4) superstructure is the same as that of the (sqrt3xsqrt3)R30 phase. In both phases, the binding energy of the S 2p3/2 core-level peak is found to be 162.2 eV, corresponding to the formation of a thiolate layer. The DFT calculations allow us to identify a viable metastable (3x4) structure where the S headgroups of the CH3S radicals select distinct adsorption sites: three quarters of them adsorb at bridge sites and one quarter at top sites. The relative energetics of the (3x4) and (sqrt3xsqrt3)R30 configurations suggest that the two structures may coexist on the surface, in agreement with experimental data.
Biagi R.
Felice Rosa Di
Marchetto D.
Pennino del U.
Renzi V. de
No associations
LandOfFree
Ordered (3x4) High Density Phase of Methylthiolate on Au(111) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Ordered (3x4) High Density Phase of Methylthiolate on Au(111), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ordered (3x4) High Density Phase of Methylthiolate on Au(111) will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-340656