AVS 49th International Symposium
    Surface Science Friday Sessions
       Session SS-FrM

Paper SS-FrM6
Extraordinary Properties of the C 1s Photoemission Line of n-alkanethiolates on Gold and Silver

Friday, November 8, 2002, 10:00 am, Room C-110

Session: Self-Assembly at Surfaces
Presenter: K. Heister, University Heidelberg, Germany
Authors: K. Heister, University Heidelberg, Germany
M. Zharnikov, University Heidelberg, Germany
L.S.O. Johansson, University Karlstad, Sweden
M. Grunze, University Heidelberg, Germany
Correspondent: Click to Email
The investigation of the C 1s photoemission line for n-alkanethiolate SAMs by synchrotron-based high resolution x-ray photoelectron spectroscopy (HRXPS) shows surprising properties. The energetic position of the C 1s emission line varies significantly by changing the substrate from Au to Ag. The analysis of this effect suggests that the observed shift of about 0.3-0.4 eV is only indirectly related to the substrate. Instead it seems to resemble the details of the film structure which change with the substrate. Besides we have observed that the C 1s peak shape alters with increasing alkyl chain length. The course of the peak shape evolution suggest a deconvolution of the C 1s emission line in several constituents. They can be attributed partly to intrinsic energy losses and partly to the influence of the close SAM-substrate interface on the innermost carbon atoms.