Adsorption and desorption of stilbene from the Ag/Ge(111)-root 3 surface
- Citation:
- Wu, H. C., Chou L. W., Wang L. C., Lee Y. R., Wei C. M., Jiang J. C., Su C., & Lin J. C. (2008). Adsorption and desorption of stilbene from the Ag/Ge(111)-root 3 surface. Journal of Physical Chemistry C. 112, 14464-14474., Sep, Number 37
Abstract:
The adsorption and desorption of stilbene on Ag/Ge(111)-(root 3 x root 3)R30 degrees (Ag/Ge(111)-root 3) were investigated using low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), temperature-programmed desorption (TPD), and density functional theory (I)FT). Both trans- and cis-stilbenes form a (2 x 1) overlayer structure on Ag/Ge(111)-root 3 at a coverage of similar to 1 ML. The STM images show parallel strips with three equivalent directions, indicating a self-ordered molecular structure. At a coverage of less than I ML, the TPD of cis-stilbene shows only one peak, attributed to submonolayer desorption. The TPD peaks are indistinguishable for desorption of trans-stilbene from the surface submonolayer and multilayer. This is due to the simultaneous desorption and/or thinning of adsorbed multilayers during the TPD process, as determined from the STM analysis of adsorbed trans-stilbene structures before and after annealing. The TPD traces fit the half-order kinetics for molecular desorption of stilbene from Ag/Ge(111)-root 3 with desorption energies of 20.1 (cis-) and 21.3 kcal/mol (trans-), which are comparable with the calculated values using the DFT method. A plausible explanation for the stilbene desorption process on Ag/Ge(111)-root 3 is proposed and discussed.
Notes:
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