Studies of the optical properties of hydrosols of 4-nm detonation nanodiamond particles performed in the 0. 2-1. 1 μm range have revealed a novel effect, a strong increase of absorption at the edges of the spectral range, and provided its explanation in terms of absorption of radiation by the dimer chains (the so-called Pandey chains) fixed on the surface of a nanodiamond particle. The effect of particle size distribution in a hydrosol on the relative intensity of Rayleigh scattering and light absorption by nanodiamond particles in this range has been analyzed.
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ACKNOWLEDGMENTS This study was supported by the Presidium of the Russian Academy of Sciences (programs “Quantum Physics of Condensed Media” and “Fundamental Research in the Field of Nanotechnologies and Nano materials”) and the Ministry of Education and Sci ence (state contract nos. 16.740.11.0216 of 25.11.2009 and 02.740.11.0108).