简介:ThesuitabilityofcalculatingatomicmultipolemomentsfromAM1wavefunctionsbycumulativepotential-derivedmethodhasbeeninvestigated.ItisshownthatthismethodhasafasterconvergenceofthefittingprocessandgivesabetterdescriptionofthechargedistributionthantheoriginalPDmethod.Atomicchargesobtainedinthiswayareofcomparablequalitywith6-31G.dataandthecalculateddipolemomentsareclosertotheexperimentaldatathanthevaluescomputeddirectlyfromtheAM1charges.Theresultsdemonstratethattheatomicmultipolemomentshigherthanmonopolemomentcanbeusedtosupplementtheatomicchargetoobtainamoreaccuratedescriptionofchargedistribution.Forthesakeofcomparison,boththeWilliamsfittingpotentialsurfaceandtheConnollyoneareusedinthecalculation.