Silicon atomic number2/23/2023 ![]() ![]() Figure 2.15 displays the configuration where two nearest C 60 face the silicon atom with a pentagonal phase. Different geometries are tested and the best configuration for the fit corresponds to a silicon atom bridging two C 60. EXAFS simulation is performed within ab initio self-consistent real space multiple scattering code FEFF8 with self-consistent scattering potentials. The striking features are a well-structured signal for C 60Si cluster-assembled films that indicates a locally well-ordered environment around silicon atoms and the large difference between x( k) for C 60Si-cluster-assembled films and other crystalline phase (Si-2 and SiC). Figure 2.15 displays the experimental EXAFS signal x( k) of various samples: C 60Si-cluster-assembled films, hexagonal SiC carbide and Si diamond. ![]() Such a bridging is corroborated by EXAFS experiments. In summary, such experiments are compatible with a silicon atom bridging two C 60 molecules. Hypothetic geometric arrangement for (C 60) 6Si 4 cluster is also displayed in Fig. The corresponding evaporation mass spectra exhibits the sequential loss of C 60Si m monomer with m = 0 and 1. After mass selection, clusters can be warmed up by irradiation with a UV laser operating at 4 eV. Figure 2.14 displays a selected mass spectrum in the region corresponding to (C 60) 7Si m with 1 < m < 4. Bridging C 60 is deduced in free phase by photofragmentation experiments and cluster-assembled films by EXAFS spectroscopy performed at the Si K-edge. For that purpose, we use a sophisticated double target (Si and C 60) laser vapourization source. Silicon atom can be incorporated between two C 60 molecules. ![]()
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