简介：Time-dependentdensity-functionaltheory(TDDFT)hasbeenappliedtocalculatetheelectronicstructureandsecond-ordernonlinearoptical(NLO)propertiesofsomeorganicmolecules.Thetwo-dimensional(2-D)chargetransfercharateristicsofcalculatedmoleculeswerestudiedandcomparedwithcorrespondingexperimentalresults.Allthetheoreticalresultsagreewellwiththemeasurement.For2-Dmoleculewithtwo-foldsymmetry,thedominantchargetransferisoff-diagonal,whileforthree-foldsymmetry2-Dmolecule,thedominantchargetransferisnotonlybetweenbranchesandcentralgroupbutalsoamongbranches.
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