傅立叶变换红外光谱分析矿物有机包裹体的限制——基体吸收问题初探

μFTIR MICROANALYSIS LIMITS OF HYDROCARBON FLUID INCLUSIONS: MATRIX MINERALS ABSORPTION

应用显微傅立叶变换红外光谱（μＦＴＩＲ）分析矿物有机包裹体时存在一个令人关注的问题，即主矿物基体吸收．分析了基体吸收存在的原因，列举了石英和碳酸钙的基体吸收范围，介绍了基体吸收消除的方法和意义，指出可以利用石英基体吸收区的１７５０ｃｍ－１附近吸收谱带指认有机化合物的羰基．

It's an interesting and troublesome problem that matrix minerals will strongly absorb mid_IR radiation over wide spectral ranges, even for very thin rock wafers. Even in those regions of the IR spectrum where no foundational vibration absorption appears, overtone and combination tone vibrations of the matrix may still be present. These vibrations may cause misidentification of the bands. If the matrix mineral is carbonate, the problem becomes important. The cause of matrix absorption, the absorption ranges of quartz and calcite, and the ways of reducing matrix absorption are prensented. It is also pointed out that the absorption band near 1750cm -1 can be used for identifying carbonyl, and emphasized that the matrix absorption should be given more attention in the analysis of IR spectrum.