

如果您无法下载资料,请参考说明:
1、部分资料下载需要金币,请确保您的账户上有足够的金币
2、已购买过的文档,再次下载不重复扣费
3、资料包下载后请先用软件解压,在使用对应软件打开
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

快乐****蜜蜂
实名认证
内容提供者


最近下载