二维傅里叶变换光谱实验方法简介（英文）-豆柴文库

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二维傅里叶变换光谱实验方法简介（英文）
Introduction
TheFouriertransformisamathematicaltoolthatallowstheanalysisofcomplexsignalsinthefrequencydomain.Inspectroscopy,theFouriertransformiscommonlyusedtoobtainthespectralinformationofasample.TheFouriertransformisapowerfultechniquethatcanprovidecomprehensiveinformationaboutthestructureandcompositionofasample.Thetwo-dimensionalFouriertransform(2DFT)isanextensionoftheconventionalFouriertransformandisusedtoobtain2Dspectralinformation.The2DFouriertransformcanbeemployedinavarietyofapplications,fromimagingofbiologicalsamplestotheanalysisofchemicalcompounds.
ExperimentalMethod
The2DFouriertransformspectroscopyisanexperimentaltechniquethatemploysaspectrometertoobtainthefrequency-domainspectrumofasample.Thesampleisirradiatedwithabroadbandpulseoflight,andtheresultingsignalisdetectedandprocessedtoobtainthespectralinformation.The2DFTexperimenthastwoessentialsteps:thepreparationofthesampleandtheacquisitionofthedata.
SamplePreparation
In2DFTspectroscopy,thesamplemustbepreparedinaspecificwaytoensurethattheresultingspectralinformationisaccurate.Thesamplemustbedissolvedinasolventthatistransparentinthespectralrangeofinterest.Thesampleconcentrationshouldbelowtopreventself-absorptionofthesignal,whichcanleadtodistorteddata.Thesampleisthenplacedinacellthatistransparenttothelightsource.Forliquids,asimpleglasscellcanbeused,whereasforsolidsamples,athinfilmistypicallydepositedonasubstrate.
DataAcquisition
The2DFouriertransformexperimentrequirestheuseofasophisticatedspectrometerthatcanmeasurethefrequency-domainspectrumofthesample.Thelightsourceshouldbebroadbandandhaveashortpulsedurationtoprovidehightimeresolutioninthedata.ThedetectedsignalismeasuredasafunctionoftimeandisthenFouriertransformedtoobtainthefrequency-domainspectrum.Thespectrometerthenmeasuresthefrequency-domainspectrumofthesampleoverarangeoffrequenciestoobtainthecompletespectralinformationofthesample.
DataProcessing
Thedataobtainedfromthe2DFouriertransformexperimentcanbeanalyzedusingvarioustechniquestoextr