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使用时间切片离子速度成像技术研究CF_2Cl_2光解动力学(英文) Title:InvestigationofCF2Cl2PhotodissociationDynamicsusingTime-SlicedIonVelocityImagingTechnique Abstract: ThephotodissociationdynamicsofCF2Cl2(dichlorodifluoromethane)hasbeeninvestigatedusingthetime-slicedionvelocityimaging(TSIVI)technique.TSIVIallowsforthevisualizationandanalysisofthevelocitydistributionoffragmentionsatdifferenttimedelaysafterthelaserpulse,providingvaluableinsightsintothephotodissociationprocessandreactiondynamics.ThisstudyaimstocharacterizetheCF2Cl2photodissociationpathways,identifytheproductsformed,andanalyzethecorrespondingkineticenergyrelease(KER)distributions. Introduction: Dichlorodifluoromethane(CF2Cl2)isanimportantindustrialchemicalwidelyusedinrefrigerantsandaerosolpropellants.However,duetoitsozone-depletingproperties,CF2Cl2hasbeenphasedoutinmanyapplications.UnderstandingthephotodissociationdynamicsofCF2Cl2iscrucialforassessingitsimpactontheenvironment,aswellasfordevelopingmoreeco-friendlyalternatives. ExperimentalSetup: TheTSIVItechniquecombinesalasersystem,avelocitymapimaging(VMI)spectrometer,andadelaystagetocaptureionimagesatvarioustimedelays.ApulsedlaserbeamisdirectedontoamolecularbeamofCF2Cl2,causingphotoexcitationandsubsequentdissociation.Theresultingfragmentionsarethenionizedbyaprobelaser,followedbyvelocitymappingusingtheVMIspectrometer.Bycontrollingthetimedelaybetweenthepumpandprobepulses,multiplesnapshotsoftheionvelocitydistributionareobtained,allowingforadetailedinvestigationoftheCF2Cl2photodissociationdynamics. ResultsandDiscussion: TheobtainedTSIVIimagesrevealthevelocitydistributionsofthefragmentionsatdifferenttimedelaysafterthelaserpulse.Theimagesexhibitdistinctpatternscorrespondingtodifferentdissociationchannelsandpathways.Bycomparingtheimagesatdifferentwavelengthsandlaserintensities,therelativecontributionsofvariousdissociationchannelscanbedetermined. Theprimarydissociationpathwayinvolvesthecleavageofthecarbon-chlorinebond,leadingtotheformationofCF2andClfragments.ThevelocitydistributionsofCF2