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Lookup NU author(s): Dr Michael Shaw, Professor Patrick Briddon
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Measurements of the absorption spectra of brown natural type IIa diamond as well as brown nitrogen-doped CVD diamond are reported. These are largely featureless and increase almost monotonically from about 1- 5.5 eV. It is argued that the brown coloration is due to an extended defect and not to a point defect. First principles modeling studies demonstrate that the spectra could be attributed to vacancy disks lying on {111} planes. Such disks are unstable above about 200 vacancies and should relax to dislocation loops in natural diamond. Hydrogen is shown to passivate the optical activity of the disks. © 2006 The American Physical Society.
Author(s): Hounsome LS, Jones R, Martineau PM, Fisher D, Shaw MJ, Briddon PR, Oberg S
Publication type: Article
Publication status: Published
Journal: Physical Review B
Year: 2006
Volume: 73
Issue: 12
ISSN (print): 1098-0121
ISSN (electronic): 1550-235X
Publisher: American Physical Society
URL: http://dx.doi.org/10.1103/PhysRevB.73.125203
DOI: 10.1103/PhysRevB.73.125203
Notes: Article no. 125203 8 pages
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