滨松HAMAMATSU分光器光谱仪图像传感器 TM-VIS/NIR C11697MB

以液氮温度(约77 K)至室温渐变的样品测试温度,通过紫外-可见-近红外(UV-Vis-NIR)吸收光谱、405 nm激发光源的光致发光(PL)光谱,结合傅里叶变换红外光谱与钻石观测仪(DiamondView TM),分别对典型的经后期高温高压或辐照处理的天然钻石、高温高压合成钻石和化学气相沉积合成钻石进行光谱学特征研究。结果表明:在不同激发光源或检测环境温度下,钻石的UV-Vis-NIR吸收光谱与PL光谱中具有指向性的特征吸收与已有文献报道结果存在一定的差异。钻石的指纹及其经优化处理的特征吸收较多出现明显的温敏特性,随着样品温度的升高,吸收峰的强度逐渐降低,部分吸收峰消失。钻石吸收光谱中的温敏特征吸收可为其检测、筛选提供指向性依据,同时对开拓新的钻石功能化应用有借鉴意义。关键词光谱学 钻石 紫外-可见 光致发光 温敏性 鉴定 spectrosc diamond ultraviol photolumi temperatu identific Abstract

Under gradually varying temperatures from liquid nitrogen temperature to room temperature, the spectroscopic characteristics of some typical natural diamonds after high temperature high pressure treatment and synthetic diamonds after high temperature high pressure or chemical vapor deposition processing are investigated by ultraviolet-visible-near infrared (UV-Vis-NIR) spectroscopy and photoluminescence (PL) spectroscopy with 405 nm excitation source combined with Fourier transform infrared (FTIR) spectroscopy and DiamondView TM. The results show that the directional feature absorptions in UV-Vis-NIR and PL spectra under different excitation light sources or test temperatures are not completely consistent with previous reports. These absorptions show clear temperature sensitivity, which attribute to the fingerprint and optimized feature absorptions. As the ambient temperature increases, the characteristic absorption peak intensity decreases gradually and some characteristic absorption peaks even disappear. The temperature-sensitive features of the diamond absorption spectra can provide important technical support and theoretical basis for the detection, screening, and characterization of diamonds, and also provide important reference for their new functional applications.