The optical properties of thiolate/Cu(110) and S/Cu(110) surfaces created by the adsorption of methanethiol and L-cysteine are investigated using reflection anisotropy spectroscopy (RAS). We find that characteristic optical signatures are obtained from these systems. The experimental RAS profiles are simulated using a four-phase model consisting of vacuum, anisotropic overlayer, anisotropic surface, and isotropic substrate. The results of the simulations suggest that a broad optical transition at 3.8 eV is associated with the thiolate/Cu (110) interface, consistent with recent first-principles calculations [S. D'Agostino et al., Phys. Rev. B 75, 195444 (2007)].
|Number of pages||6|
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 27 Aug 2010|