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Description:Thislecturecoversintermolecularinteractions,electronicspectroscopy,andtheFranck-CondonprincipleTheFranck-CondonPrincipleΔR =“verticaltransitions”TheFranck-CondonPrincipleJ.TellinghuisenDepartmentofChemistry,VanderbiltUniversity,Nashville,TN,USAIntroductionTheFranckCondonPrincipleisathreadrunningthroughallofmolecularspectroscopyandmuchofatomicandmolecularphysicsItiseverywhereinphysicalchemistryfrom excitationenergyIntroductionElectronicSpectraofDiatomicmoleculesVibronicTransitionandVibrationalProgression:FranckCondonPrincipleEnergylevels, molecularorbitalIINTRODUCTIONNowtheFranck-Condonprinciplesuggeststhatatransitionoccursverticallyonthisdiagram,sincetheinternuclear distancedoesnotchangeThisisdueinfactthatnucleiaremuchmoremassiveequilibriuminternucleardistanceasthelowerThe‘vertical’transitionisthe strongestItiseverywhereinphysicalchemistryfromexcitationenergytransfer(EET)toelectrontransfer(ET)ConferencepaperAccessesFranck-Condon factors.Inanelectronicprocess,nucleihavenotimetomove,sothenuclearwave-functionstaysthesame!Itstatesthatwhenamoleculeisundergoingan electronictransition,suchasionization,thenuclearconfigurationofthemoleculeexperiencesnosignificantchange.Partofthebookseries:SpringerProceedingsin Physics((SPPHY,volume))AbstractForunboundexcitedstates,theelectronicspectrumisbroadanddiffuseAssumedknowledgeLearningoutcomesBeableto useS,DandTtolabelthespinmultiplicityofanelectronicstateBeabletodescribehowenergyislostafterabsorptionbyLectureElectronicSpectroscopy: Franck-CondonViewingvideosrequiresaninternetconnectionDescription:Thislecturecoversintermolecularinteractions,electronicspectroscopy,andthe Franck-CondonprincipleIammakingalivingoneofitManydynamicalproblemsTheFranck–Condonprinciple(namedforJamesFranckandEdwardCondon) isaruleinspectroscopyandquantumchemistrythatexplainstheintensityofvibronictransitions(thesimultaneouschangesinelectronicandvibrationalenergy levelsofamoleculeduetotheabsorptionoremissionofaphotonoftheappropriateenergy)ThisiscalledtheFranck-Condonprinciple.Thisprovidesadirect assessmentofthewavefunctionofLectureElectronicSpectroscopy:Franck-CondonToinvestigatetheTheFranck-CondonPrincipledescribestheintensitiesof vibronictransitions,ortheabsorptionoremissionofaphotonTheprincipleismoregeneralthanjustforopticaltransitionsTheFranck-Condon(FC)principle, whichdeterminestherelativeintensityofthevibration-assistedelectrontransitionspectrum,isofmuchsignificanceinThisistheFranck-Condonprinciple,that transitionintensitiesaredictatedbytheverticaloverlapbetweennuclearwavefunctionsinthetwoelectronicsurfacesCase-II:Whenre’rFranck–Condon PrinciplegovernsrelativeintensitiesofthevibrationalbandsinanelectronictransitionThusthestrongestspectrallineofthev"=progressionwillbethe(0,0)This observedinOmoleculeTheThisiscalledtheFranck-CondonprincipleTheprincipleismoregeneralthanjustforopticaltransitionsTheFranck-Condon principleisbasedonsuddenpromotionofonee,sofastthatnucleirespondonlyafterthee excitation.Franck‐CondonPrinciple(classicalidea)•TheFranck‐CondonPrinciplestatesthataselectronsmoveverymuchfasterthannuclei,thenucleiaseffectivelystationaryergyTheFranck-Condonprinciplegoverning molecularelectronictransitionsisutilizedtostudyheavy-quarkhadronaysJTellinghuisen