FTIR原理

Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,Click to edit Master title style,13,13,March 17, 2010,FTIR,光譜學原理,Why used FTIR,非破壞性分析 , 操作簡單 , 分析快速,樣品直接分析 , 幾乎勿需前處理,配合資料庫搜尋,可作未知物分析,可利用化學官能基強度或光譜特性變化 , 來做定量分析,無需化學試劑 , 無環境污染問題 , 安全無污染,Introduction: The Electromagnetic Spectrum,Increasing,Energy,Radio,Micro,FIR,IR,NIR,UV,X-ray,Gamma,4000,400 cm-1,12,820,50,000,25 000 nm,2500,780,380,200,Increasing,Wavelength,K-shell electrons,Outer-shell electrons,Molecular vibrations,Molecular Rotation,Infrared (IR) Spectroscopy,.,-C-H2850-2960 cm,-1,-C=O1640-1750 cm,-1,=C-H3020-3100 cm,-1,-C-O1050-1150 cm,-1,-C=C-1650-1670 cm,-1,-O-H3400-3640 cm,-1,-C-,Cl,600-800 cm,-1,-N-H3310-3500 cm,-1,-C-Br500-600 cm,-1,Vibration frequencies are influenced by,Atom Size,Environment,Bond Strength,O,H,H,.provides a vast amount of chemical information,IR Spectroscopy measures the radiation absorbed by materials due to molecular vibrations,Why Use Infrared Spectroscopy?,Fourier Transform,InfraRed,(FT-IR) spectroscopy is an extremely powerful technique for identifying the molecular composition of many organic and inorganic materials. When analysed by infrared spectroscopy, materials produce a spectrum or fingerprint.,March 17, 2010,FTIR,設計原理,What is a FTIR,利,用干涉光譜做傅利葉轉換,(,FT(t,) ) ,得到有機光譜,應用,:,利,用有機物振動光譜得到官能基,(function group),及指紋區,(fingerprint),光譜,做定性及定量分析,Spectrum 100 Interior,source,motor,j-stop,filter wheel,kinematic mirror,laser,power supply,interferometer,detector,2,nd,detector location,建設性干涉,Source,Rotary scan pair,破壞性干涉,Source,Rotary scan pair,干涉圖形產生,-50.0,-40,-30,-20,-10,0,10,20,30,40,50,M,EGY,傅利葉轉換,傅利葉轉換,4400.0,2000,1000,450.0,cm-1,EGY,4400.0,2000,1000,450.0,0.3,20,40,60,80.8,cm-1,%,T,Ratio,