National Synchrotron Radiation Research Center, No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan, Republic of China.
Anal Chem. 2012 Nov 6;84(21):9596-600. doi: 10.1021/ac302545u. Epub 2012 Oct 19.
Photoluminescence (PL) spectra of natural diamond powders of type IaAB at 300 and 13 K were excited with synchrotron radiation in the wavelength range of 150-260 nm. The spectral features observed in the excitation spectra at 13 K show four vibrational progressions related to nitrogen defects in diamond: A, B, B', and N3. Progression A has a spacing of 1258 ± 40 cm(-1), associated with the N2 (or A) center; progression B has a spacing of 1181 ± 40 cm(-1) and progression B' has a spacing of 744 ± 40 cm(-1) related to the N4 (or B) center; and progression N3 has a spacing of 1417 ± 40 cm(-1) associated with the N3 center. The PL of these defects comprise continuous emission with two broad lines with maxima of ∼420 and 469 nm at 300 K. Upon excitation with light at wavelengths of <200 nm, the distinct zero-phonon lines of N3 and N4 centers in diamond at a temperature of 13 K become prominent at 416.0 and 491.2 nm, respectively. The vibrational progressions in the photoluminescence excitation (PLE) spectra of N2, N3, and N4 centers in diamond of type IaAB at 13 K are identified for the first time. We suggest the use of PL spectra excited in the region of 160-240 nm to analyze and identify the type of diamond.
采用同步辐射在 150-260nm 的波长范围内激发 IaAB 型天然金刚石粉末在 300 和 13K 下的光致发光（PL）光谱。在 13K 下激发光谱中观察到的光谱特征显示了与金刚石中氮缺陷有关的四个振动级进：A、B、B'和 N3。A 级进的间距为 1258±40cm(-1)，与 N2（或 A）中心相关；B 级进的间距为 1181±40cm(-1)，B'级进的间距为 744±40cm(-1)，与 N4（或 B）中心相关；N3 级进的间距为 1417±40cm(-1)，与 N3 中心相关。这些缺陷的 PL 由连续发射组成，在 300K 时有两个宽峰，最大值分别为 ∼420 和 469nm。在 13K 时，用小于 200nm 的光激发时，金刚石中 N3 和 N4 中心的明显零声子线分别在 416.0nm 和 491.2nm 处变得突出。首次在 IaAB 型金刚石中 N2、N3 和 N4 中心的光致发光激发（PLE）光谱中识别出振动级进。我们建议使用在 160-240nm 区域激发的 PL 光谱来分析和识别金刚石的类型。
