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Surface Enhanced Raman Spectroscopy as a tool - ICPC ：表面增强拉曼光谱作为一种工具——ICPC奈米碳网.ppt

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SurfaceEnhancedRamanasTooltostudyDrugProteinInteractionsandNucleicAcidDetectionChandrabhasNarayana(BHAS)ChemistryandPhysicsofMaterialsJawaharlalNehruCentreforAdvancedScientificResearch,.,Bangalore560064,******@,2011Whathappenswhenlightfallsonamaterial?TransmissionReflectionAbsorptionLuminescenceElasticScatteringInelasticScatteringWhyareSkyandSeaBlue?=3835cm-1n2=1648cm-1n3=3939cm-1n=2991cm-1n=4139cm-1n1=-1n2=1022cm-1n3=-1n1=-1n4=-1n3=-1n5=-1n6=-1n2=-1n4=-18086cm-1=1eVRoomTemp=25meVClassicalPictureofRamanStokesRamanAnti-StokesRamanInducedPolarizationPolarizabilityTaylorExpansionEnergydiagramandQuantumpictureVibrationalstatesElectronicstatesVirtualstatesgexphoton<eg,p2|Her|p2,eb><eb,p2|Hep|p1,ea><ea,p1|Her|p1,eg>|Es-Eb|x|Ei-Ea|Sa,bRamancrosssectionIfEi=EaorEs=l4IsotopeeffectClhastwoisotopes35Cland37ClRelativeabundanceis3:1Raman,FluorescenceandIRScatteringAbsorptionandemissionAbsorptionProblemswithRaman:VeryWeak–SurfaceEnhancedRamanSpectroscopyInitially––,AuandCuthenextbest,Al,In,,polarization,exactnatureofthenanostructurealsoeffecttheSERS

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