The initial stages of graphite formation on the diamond (100) 2×1 surface

Reflection anisotropy spectroscopy of the oxidized diamond (001) surface

“…Following annealing LEED results showed a well ordered two-domain 2 × 1 pattern (figure 1). XPS showed the single component symmetrical C 1s photoelectron line-shape characteristic of H terminated C(001) 2 × 1 surfaces [14,15]. The RAS spectrum obtained from this H terminated surface is shown in figure 2.…”

“…The LEED patterns of the H/C(001) 2 × 1 and clean C(001) 2 × 1 surfaces are indistinguishable so LEED alone cannot be used to characterize the desorption of H from the H terminated surface. However heating of the H terminated specimens to 1500 K in UHV for periods of 30 min produced changes in the C 1s photoelectron line-shape that are characteristic of the C(001) 2 × 1 reconstructed surface [14,15] indicating that H has been desorbed from the H/C(001) 2 × 1 surface. The C 1s photoelectron line-shape of the H/C(001) 2 × 1 surface differs from that of the C(001) 2 × 1 surface in that while the former is symmetrical due to the H termination of the surface C atoms producing a local surface environment similar to that of bulk C the latter shows a weak shoulder on the high kinetic energy side of the bulk C1s peak that is characteristic of the surface dimers on the C(001) 2 × 1 reconstructed surface.…”

Contribution of steps to optical properties of vicinal diamond (100):H surfaces

“…The XPS results showed that gentle heating to 500 K in UHV removed adventitious adsorbed hydrocarbons and oxygen species and produced clean H/C(100) surfaces with the single-component symmetrical C 1s photoelectron line shape characteristic of H-terminated C(100) 2 × 1 surfaces. 40,41 RAS measurements were made on the H-terminated C(100) 0 • , 2 • , and 4 • surfaces in UHV following characterization of the specimens by XPS and LEED. The RAS instrument was of the Aspnes design 17 and was mounted external to the UHV chamber, projecting and receiving light through a lowstrain window.…”