Diamond C 1s core-level excitons: Surface sensitivity
Alastair Stacey, Bruce CC Cowie, Julius Orwa, Steven Prawer, Alon Hoffman
PHYSICAL REVIEW B | AMER PHYSICAL SOC | Published : 2010
The effect of surface termination on C 1s core-level bulk excitons found near the surface in single-crystal diamond is reported. By simultaneously recording bulk (total electron yield) and surface (partial electron yield) near-edge x-ray absorption fine-structure (NEXAFS) spectra with a range of single-crystal surface terminations, variable bulk exciton energy blueshifts and linewidth broadening were observed, most notably in the reconstructed single-crystal diamond. Investigation of polycrystalline diamond and ultrananocrystalline diamond films, using the same technique, allowed for a comparison between the reconstructed single-crystal diamond surface and nanodiamond bulk excitons. These fi..View full abstract
The authors would like to thank Dieter Gruen and Oliver Williams for provision of a nanocrystalline diamond sample for this work. This research project was carried out with the financial support of the Israeli Academy of Science and Arts, the Technion Fund for promotion of research and the Australian Research Council. A.H. was supported by the Australian Research Council during the project.