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- W83308519 endingPage "232" @default.
- W83308519 startingPage "211" @default.
- W83308519 abstract "The scattering of low energy electrons is an ideal probe of the structure of surfaces because of their high cross section for both elastic and inelastic scattering. The elastically scattered fraction is utilized in low energy electron diffraction (LEED) to determine the structure of clean solid surfaces and of monolayers of adsorbates, atomic or molecular. The loss of electron energy to the vibrational modes of atoms and molecules can also be used to determine the surface structure of atoms and molecules. This technique is known as high resolution electron energy loss spectroscopy (HREELS). We shall focus on the structures of small molecules, CO, and several olefins that were recently determined by both LEED and HREELS studies. When adsorbed on metal (Pt and Rh) crystal surfaces, several binding states of CO have been uncovered that fill up as a function of coverage. Acetylene, ethylene, propylene, methylacetylene, and butenes all undergo transitions as a function of temperature and are accompanied by drastic changes in bonding. The most stable molecular arrangement appears to be the alkylidyne structure with the C-C bond axis perpendicular to the metal surface and the molecule anchored to a 3-fold surface site. Increased temperatures lead to sequential bond breaking fragmentation. The CH and C 2 H fragments appear to be the active species present on transition metal surfaces during catalytic reactions. The vibrational spectra obtained on single crystal and dispersed rhodium particle surfaces will be compared." @default.
- W83308519 created "2016-06-24" @default.
- W83308519 creator A5007657025 @default.
- W83308519 creator A5058666235 @default.
- W83308519 creator A5063644424 @default.
- W83308519 creator A5068058105 @default.
- W83308519 creator A5082399049 @default.
- W83308519 date "1982-01-01" @default.
- W83308519 modified "2023-09-23" @default.
- W83308519 title "THE STUDY OF THE STRUCTURE OF ADSORBED MOLECULES ON SOLID SURFACES BY HIGH RESOLUTION ELECTRON ENERGY LOSS SPECTROSCOPY AND LOW ENERGY ELECTRON DIFFRACTION" @default.
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