Abstract
The peak near 1150 in the visible Raman spectra of poor quality chemical-vapor-deposited diamond is often used as the signature of nanocrystalline diamond. We argue that this peak should not be assigned to nanocrystalline diamond or other -bonded phases. Its wave number disperses with excitation energy, its intensity decreases with increasing excitation energy, and it is always accompanied by another peak near 1450 , which acts similarly. This behavior is that expected for -bonded configurations, with their smaller band gap. The peaks are assigned to transpolyacetylene segments at grain boundaries and surfaces.
- Received 1 September 2000
DOI:https://doi.org/10.1103/PhysRevB.63.121405
©2001 American Physical Society