Correlation between EPR spectra and coloration of natural diamonds

被引：7
|
作者：
Lee, Charis W. Y. [1 ]
Cheng, Juan [1 ]
Yiu, Y. C. [1 ]
Chan, K. [1 ]
Lau, Dominique [1 ]
Tang, W. C. [1 ]
Cheng, K. W. [1 ]
Kong, Tom [1 ]
Hui, Tony K. C. [1 ]
Jelezko, Fedor [2 ]
机构：
[1] Master Dynam Ltd, Hong Kong, Peoples R China
[2] Ulm Univ, Inst Quantum Opt, Ulm, Germany
来源：
DIAMOND AND RELATED MATERIALS | 2020年 / 103卷
关键词：
CENTERS;
D O I：
10.1016/j.diamond.2020.107728
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
White diamonds color grading is one of the basic diamond evaluations. The color value based on a scale that ranges from D to Z, with D being the more colorless and more valuable, among other qualifications. As the diamond grade moves on this scale, its color appears more yellow progressively. This yellowish color, present only in Type I diamonds, is mainly due to the nitrogen related defects such as N-3 center and C-center. The current color grading system is based on a visual method, where gemologist compares the sample with a Master Color set. However, this method is very subjective. Several defects responsible for light absorption in diamond are carrying electron spin and appear in Electron Paramagnetic Resonance (EPR) spectrum. In this study, we developed a new EPR based technique for a quantitative measurement of N-3 Center and C-center in diamond through quantitative EPR spectroscopy. The correlation between EPR spectra and color grades of diamond was established.
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页数：5
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