使用带近红外光纤探头附件红外光谱仪鉴定翡翠B货

带有近红外光纤探头附件的红外光谱仪是一种有效的、非破坏性鉴定工具，用于鉴定漂白及聚合物充填处理的翡翠(所谓翡翠B货)。此项技术在鉴定翡翠中具有下列优点：不但能对较厚的或镶嵌的翡翠饰品进行鉴定，而且能耐非常大的翡翠饰品，如手镯、大型雕件等进行鉴定，这对其它红外技术来讲是望尘莫及的。本项技术的关键在于使用了光纤探头，并且在近红外频率范围进行测试。因此，能获得7400cm^-1至4000cm^-1频率范围内情晰明确的近红外光谱。翡翠B货在此频率范围内产生的吸收光谱起因于C—H键伸缩振动与弯曲振动的合频以及伸缩振动的倍频。

IDENTIFICATION OF B JADE BY FTIR SPECTROMETER WITH NEAR-IR FIBRE-OPTIC PROBE ACCESSORY

A FTIR spectrometer with a near-IR fibre-optic probe accessory has been found to be a usefuland non-destructive tool for identification of bleached and polpoer-impregnated jadeites (so-called Bjade ).This method has the advantage of application to the testing of not only very thick or mountedstones, but also very large samples such as bracelets , which are difficult to test with other IR techniques. The important features of the technique are use of the fibre-optic probe and measurement of thenear-IR frequency range. Therefore, clear near-IR absorption spectra from 7 400 to 4 000cm-1 could beobtained. The absorptions are caused mainly by the combination of stretching and bending vibrationsand the harmonics of stretchinS vibration of C-H bonds.