Isotopieverschiebungskonstanten von Th, U, Pu und Am

摘要: The isotope shifts of unperturbed electron configurations have been determined from shift measurements in the spectra Th, U, Pu, and Am. screening 7s charge density at nucleus by 6d, 7s, 7p electrons is discussed. It turns out that same factors as for 6s lighter elements can be used. one 5f amounts to about 25%: [δT(fns)−δT(fn)]/[δT(fn}s)−δ(fn})]=0.75. due filleds (andp1/2) shells considerabely screened anf electron. shiftδT(fn}-1dm+2)−δT(fndm) produced this effect order magnitude shiftδT(fndms)-δT(fndm) ans experimental constants are found be:Β Cexp(Th230–Th232)=880±120;Β Cexp(U233–U235)=1000±180;Β Cexp(U234–U236)=1070±200;Β Cexp(U236–U238)=1080±180;Β Cexp(Pu238–Pu240)=1200±120;Β Cexp(Pu239–Pu241)=1060±100;Β Cexp(Pu240–Pu242)=900 ±90;Β Cexp(Am241–Am243)=890±50 [10−3cm−1]. ratiosΒ Cexp/Cth