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Fritsch, E., Hainschwang, T., Massi, L. & Rondeau, B. (2007) Hydrogen-related optical centers in natural diamond: An update. New Diam. Front. Carbon Technol. 17 63–89.
Added by: Laurent Cournède (2016-03-10 22:02:31) |
| Type de référence: Article Numéro d'identification (ISBN etc.): 1344-9931 Clé BibTeX: Fritsch2007b Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: chameleon diamonds, cuboid, Defects, growth, high-pressure, hydrogen, impurity, infrared-absorption, Natural diamond, nickel-nitrogen complexes, nitrogen, optical centers, spectroscopy, synthetic diamond, yellow diamonds Créateurs: Fritsch, Hainschwang, Massi, Rondeau Collection: New Diam. Front. Carbon Technol. |
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Many absorptions in the infrared (IR) and UV-visible range in natural diamond have been related to the presence of hydrogen. The 3107 cm(-1) system is the most important system in the infrared range, and is related to hydrogen strongly linked to carbon and weakly linked to nitrogen. When the intensity of the 3107 cm-1 absorption is greater than that of the intrinsic band at about 2450 cm(-1), the diamond is called hydrogen rich (H-rich), and may exhibit specific optical properties; it is typically formed by cuboid growth. In total, about 90 sharp lines or absorption systems have been at least tentatively related to hydrogen in the infrared range (see Table 1); many of them have been documented very recently. Six groups of H-containing diamonds can be defined to help categorize such materials. Three families of color may be found for H-rich diamonds: the "brown to grayish-yellow to green" family, the "gray to blue to violet" family, and the "chameleon" family. The structure at the atomic level of the defects responsible for the component absorptions is still unknown. There seems to be no direct relationship between IR-active centers and visible centers. Furthermore, it is likely that not all the hydrogen is optically active, and the quantification of hydrogen concentration on the basis of optical absorption intensity remains a challenge.
Added by: Laurent Cournède |