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红外线是波长为0.7μm-1mm的电磁波。当一束具有连续波长的红外光照射某物质时,此物质的分子就会吸收某些一定频率的光能,转变成分子的振动能和转动能,因此若将透过的光用单色器色散并加以记录,以波数或波长为横座标,以透过率或吸收率为纵座标,就得到该物质的红外吸收光谱图。
Infrared is a wavelength of 0.7μm-1mm electromagnetic waves. When a bunch of infrared light with a continuous wavelength of radiation on a material, the material molecules will absorb some of the light energy at a certain frequency, the molecular vibrational energy and rotational energy, so the light through the monochromator Dispersion and record, to wave number or wavelength for the abscissa, the transmittance or absorption rate for the vertical axis, you get the infrared absorption spectroscopy of the material.