15 January 1989 Optical Properties Of Some Natural Diamonds With High Hydrogen Content
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We have demonstrated for the first time that in diamonds some defects correlated with the presence of intense H-related infrared absorptions, also absorb in the visible range. These diamonds exhibit two types of optical absorption spectra, resulting in a browniqh yellow or gray color. We believe that the 1405 and 3107 cm-1 H-related infrared absorptions are not simply due to C-H vibrations, but rather to stretching modes of complexes involving hydrogen and nitrogen in all cases. These types of H-rich brownish yellow and gray diamonds - or sectors of particular stones - are probably the result of cuboid growth.
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Emmanuel Fritsch, Emmanuel Fritsch, Kenneth V. G. Scarratt, Kenneth V. G. Scarratt, } "Optical Properties Of Some Natural Diamonds With High Hydrogen Content", Proc. SPIE 1146, Diamond Optics II, (15 January 1989); doi: 10.1117/12.962079; https://doi.org/10.1117/12.962079

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