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InfraredSpectroscopyTransmissionVsATR红外光谱透射比ATR.ppt

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InfraredSpectroscopy:(ATR)techniquesBasedonstudyby:Koulis,Cynthia,,?Spectroscopy-icradiationexcitationtohigherenergystateshv=|E2–E1|Electronic>Vibrational>RotationalInfraredRadiationFrequencies-12800to10cm-1(cm-1=wavenumbers)DividedintothreeRegionsNear:12800to4000cm-1Middle:4000to200cm-1Far:200to10cm-1Radiationofmostuseforspectroscopyfallsinthemid-infraredregionbetween4000to670cm-150InfraredAbsorptionAbsorptionofIRradiationexcitationofvibrationalandrotationalenergylevelsnotsufficientenergyforelectronicexcitationVibrationalenergystatesareofgreatestimportanceforIRspectroscopyDynamicDipoleMomentAbsorptionofIRradiationisonlyobservedinmoleculeswithadynamicdipolemomentAninduceddynamicdipolemomentisobservedinpolarmoleculesMagnitudeofdipolemomentdependsonoverlapofelectrondensitiesinmoleculeVibrationresultsinchangeininternucleardistanceandthereforefluctuationsinmagnitudeofdipoleHomonucleardiatomicmolecules(,N2,O2)don’tabsorbIRradiation,b/cofnodynamicdipolemomentIRabsorptionIFvibrationalfrequencyofmolecule=frequencyofradiationTHENenergyisabsorbedResultspromotiontohigherenergylevelandincreaseinamplitudeofmolecularvibrationMolecularVibrationsMolecularVibrationalandBendingmodesSingleabsorptionpeakappearsforeachmodewithadynamicdipolemomentInterpretingtheSpectraPeaksareidentifiedby:-Intensity-Shape-PositionCorrelationchartsareusedtoaidinidentifyingfunctionalgroupabsorptionbands

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