National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan.
Anal Chem. 2011 Sep 1;83(17):6539-44. doi: 10.1021/ac200808n. Epub 2011 Aug 1.
Various diamonds were analyzed with photoluminescence (PL) spectra excited with synchrotron radiation in the wavelength range 160-250 nm. The emission of type IaAB diamond begins near 300 nm and extends to 700 nm; two broad lines with maximums about 419 and 469 nm correspond to energies 2.96 and 2.64 eV, respectively. The spectral features observed in the PL excitation spectra show two vibrational progressions, A and B, related to nitrogen defects in diamond. Progression A has a spacing 1266 ± 20 cm(-1) and is associated with the N2 (or A) center of a nitrogen defect, whereas progression B has a spacing 1177 ± 20 cm(-1) related to the N4 (or B) center of a nitrogen defect. These vibrational progressions in PL excitation spectra of N2 and N4 centers in type IaAB diamond are here identified for the first time. We suggest the use of PL spectra excited in the region 170-240 nm to analyze and to identify the type of diamond.
采用波长范围为 160-250nm 的同步辐射光激发，对各种钻石进行了光致发光（PL）光谱分析。IaAB 型钻石的发射始于近 300nm 并延伸至 700nm；两个具有约 419nm 和 469nm 最大值的宽带线分别对应于 2.96eV 和 2.64eV 的能量。在 PL 激发光谱中观察到的光谱特征显示了两个与钻石中氮缺陷有关的振动级进，A 和 B。级进 A 的间距为 1266±20cm-1，与氮缺陷的 N2（或 A）中心相关，而级进 B 的间距为 1177±20cm-1，与氮缺陷的 N4（或 B）中心相关。IaAB 型钻石中 N2 和 N4 中心的 PL 激发光谱中的这些振动级进在这里是首次被识别。我们建议使用在 170-240nm 区域激发的 PL 光谱来分析和识别钻石的类型。
