DiamondView^(TM)下呈黄色荧光的天然钻石的FTIR光谱特征

FTIR spectral characteristics of natural diamonds with yellow fluorescence viewed under DiamondView^(TM)

利用傅里叶变换红外(FTIR)光谱结合钻石观测仪(DiamondView^(TM))、紫外-可见(UV-Vis)吸收光谱对在DiamondView^(TM)下呈现黄色荧光的天然钻石进行较系统的研究。结果表明:绝大多数在DiamondView^(TM)下呈现单一黄色或部分黄色荧光的天然钻石,其FTIR光谱中一般在1 282 cm^(-1)处有较强的吸收峰,因此,初步认为该类钻石晶格中的双N(N_2)即A中心是钻石呈现黄色荧光的形成机制之一。但同时发现少数荧光呈现黄色的钻石的FTIR谱图中缺失1282 cm^(-1)处的吸收,且对应样品的FTIR光谱中存在1 450 cm^(-1),处或UV-Vis吸收光谱中存在741nm的特征吸收,即该类钻石的黄色荧光可能是辐照所致。

The formation mechanism of yellow fluorescence for natural diamonds viewed under DiamondViewTM are systematic investigated by Fourier transform infrared spectra （FTIR） combined with DiamondViewTM and UV-Vis-NIR absorption spectra. The results show that most of diamonds with yellow fluorescence or partly yellow fluorescence have an infrared absorption peak at 1 282 cm^-1 namely A center. It is deduced that the yellow fluorescence derived from the N2 optical center in the diamond lattice. Furthermore, a few of diamonds with yellow fluorescence have not the 1 282 cm^-1 absorption perk, but existed 1 450 cm^-1 in their corresponding FTIR spectra or 741 nm in their corresponding UV-Vis absorption ones. The yellow fluorescence observed in the DiamondViewTM can be produced by irradiation.