中国农业大学：《有机化学》课程教学课件（PPT讲稿）第七章 有机波谱分析 Structure Analysis of Organic Compounds by Spectrum

7.3 Infrared Spectroscopy7.3.1Introduction7.3.1.1 Infrared Spectroscopy0.5～2.5nm近红外区0.5~1000nm2.5~15.4um（4000/cm~650/cm)中红外区Regions50～1000nm远红外区1.instantaneous dipolemomentFactors which2.Vibration frequency ofchemical bond isDetermine theIR Absorptionsame to that of IR radiation

7.3 Infrared Spectroscopy 7.3.1 Introduction 7.3.1.1 Infrared Spectroscopy 0.5～1000nm Regions 0.5 ～2.5nm 近红外区 2.5 ～15.4m（4000/cm ～650/cm)中红外区 50 ～1000nm远红外区 Factors which Determine the IR Absorption 1. instantaneous dipole moment 2. Vibration frequency of chemical bond is same to that of IR radiation

7.3.1.2Expression ofIR spectrum2,5910121520250.20.30.10.5CH,CH.CH.CH,-C-CH:1.0CH,40003600320028002460200018001600140012001000600600400v（cm-1Fig7-4 IR of2-Methyl-1-hexene

7.3.1.2 Expression of IR spectrum Fig7-4 IR of 2-Methyl-1-hexene

7.3.1.3Infrared SpectrometerMMMMMFig7-5.OpticalSystem of anInfrared Spectrometer

7.3.1.3 Infrared Spectrometer Fig 7-5. Optical System of an Infrared Spectrometer