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Explicitcalculationshowsthatthezeroorderofquantummechanicalmatrixelementsofhydrogenatom’sinverseradiusinthequasi classicalcaseareHeisenbergmatrixelements,andthefirst ordertermplaysarolewhenthedifferencebetweentheprincipalquantumnumbersislarge .Intheclassicallimit,quantummechanicalresultsareidenticaltoHeisenbergones







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