红外光谱分析是矿物材料研究中常用的一种表征手段, 而衰减全反射红外光谱(ATR-FTIR) 由于其快速、 无损且能够进行微区检测等优势在而被广泛使用。 以不同产地琥珀、 柯巴树脂和覆膜处理琥珀为研究对象, 通过BRUKER LUMOS独立式红外显微镜对样品的ATR-FTIR光谱进行测试与分析。 结果表明: ν(CC)伸缩振动在1 643 cm-1和δ(芳C—H)弯曲振动在889 cm-1两处的红外吸收谱带均出现在多米尼加和俄罗斯琥珀中; 由ν(C—O)伸缩振动在1 300～925 cm-1范围内的红外吸收谱带对于琥珀的产地具有一定的指示意义; νas(CH2)不对称伸缩振动在3 080, 1 643和887 cm-1三处的红外吸收谱带为柯巴树脂所特有, 具有重要的鉴定意义; 覆膜琥珀显示琥珀和人工树脂混合红外光谱, 除琥珀特有的红外光谱之外, 760和702 cm-1红外吸收谱带为人工树脂中γ(芳C—H)面外弯曲振动所致。 ATR-FTIR在琥珀的成因、 产地及优化处理品种的检测具有重要的意义。

Infrared spectral analysis is a commonly used means to research the characteristics of mineral material. Attenuated total internal reflectance infrared spectroscopy (ATR -FTIR) is widely used dues to its advantages such as rapidness, non-destructiveness and micro region detection. This paper focuses on different areas of amber, copal resin, coated amber to further study its ATR-FTIR through the BRUKER LUMOS independent type infrared microscope. The result shows: the two infrared absorption spectrum which are 1 643 cm-1 due to stretching vibration of ν(CC) and 889 cm-1 due to deformation vibration of δ(arene C—H)are present in the amber originated in Dominica and Russia; the infrared absorption spectrum band lies at 1 300～925 cm-1 due to stretching vibration of ν(C—O) has a certain instruction significance for the origin of amber; the three absorption spectrum of 3 080 cm-1 which is due to dis-symmetry stretching vibration of νas(CH2), 1 643 and 887 cm-1 can be used as characteristic of copal resin and have identification significance; coated amber displays amber and artificial resin mixing infrared spectrum, which besides the characteristic infrared spectrum of amber, 760 and 702 cm-1 infrared spectrum are caused by out-plane bending vibration of γ(arene C—H) of resin. ATR-FTIR has important significance in the identification of cause, origin and enhancement varieties of amber.