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On unusual deep-violet microcrystals of diamonds from placers of Ukraine

¹ Institute of Geochemistry, Mineralogy and Ore Formation, National Academy of Sciences of Ukraine, Palladin Ave. 34, 03680 Kyiv-142, Ukraine
² Institut für Angewandte Geowissenschaften I, Technische Universität, Ernst-Reuter-Platz 1, D-10587 Berlin, Germany

^* Corresponding author, e-mail: taran{at}mineral.freenet.kiev.ua

A distinctive feature of Ukrainian deep-violet diamond microcrystals is a broad absorption band centered at about 560 nm (17850 cm^–1 or 2.21 eV). In the Ukrainian samples, the intensity of this band is almost two orders of magnitude greater than in a light-rose diamond from Yakutia. Previously (Taran et al., 1998), the band was attributed to the N-V center because the absorption spectrum of the negative N-V center in irradiated and annealed type Ib diamonds is known to have an absorption band with a maximum at a similar wavelength. However, this assignment is not confirmed by vibrational spectroscopy and low temperature optical absorption spectroscopy in all crystals studied. In addition, at 77 K the band 17850 cm^–1 displays no fine structure that unambiguously evidences that it can not be the band at 2.2 eV, commonly attributed to the N-V center.

Key-words: diamond, electronic and vibrational spectroscopy.

This article has been cited by other articles:

				M. N. TARAN, V. M. KVASNYTSYA, K. LANGER, and K. O. ILCHENKO Infrared spectroscopy study of nitrogen centers in microdiamonds from Ukrainian Neogene placers European Journal of Mineralogy, February 1, 2006; 18(1): 71 - 81. [Abstract] [Full Text] [PDF]