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Adsorption and Desorption of Stilbene from the Ag/Ge(111)-√3 Surface
- Source :
- The Journal of Physical Chemistry C. 112:14464-14474
- Publication Year :
- 2008
- Publisher :
- American Chemical Society (ACS), 2008.
-
Abstract
- The adsorption and desorption of stilbene on Ag/Ge(111)-(√3 × √3)R30° (Ag/Ge(111)-√3) were investigated using low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), temperature-programmed desorption (TPD), and density functional theory (DFT). Both trans- and cis-stilbenes form a (2 × 1) overlayer structure on Ag/Ge(111)-√3 at a coverage of ∼1 ML. The STM images show parallel strips with three equivalent directions, indicating a self-ordered molecular structure. At a coverage of less than 1 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(...
- Subjects :
- Annealing (metallurgy)
Chemistry
Analytical chemistry
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Overlayer
law.invention
General Energy
Adsorption
Electron diffraction
law
Desorption
Molecule
Density functional theory
Physical and Theoretical Chemistry
Scanning tunneling microscope
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 112
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi...........59ed1db6ffcab5d2c3f6dc5bb1f2e369