第一节 概述 Region Wavelength range Wave number range (m) (cm1) Near 0.78-2.5 12800-4000 Middle 2.5-50 4000-200 Far 50-1000 200-10 The most useful I.R.region lies between 4000- 670cm-1 3 第一节 概述 Region Wavelength range Wave number range (µm ) (cm-1 ) Near 0.78 - 2.5 12800 – 4000 Middle 2.5 – 50 4000 – 200 Far 50 -1000 200 - 10 The most useful I.R. region lies between 4000 - 670cm-1