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Relativistic coupled-cluster(RCC) theory has been employed to calculate thelife time of the $6 ^2P_{3/2}$ state of single ionized lead($^{207}Pb$) to anaccurac y of 3% and compared with the corresponding value obtained using secondorder r elativistic many-body perturbation theory(RMBPT). This is one of thevery few ap plications of this theory to excited state properties of heavyatomic systems. C ontributions from the different electron correlation effectsare given explicitl y

Ab initiodetermination of the lifetime of the 62P3/2state for207Pb+by relativistic many-body theory

Ab initiodetermination of the lifetime of the 6²P_3/2state for²⁰⁷Pb⁺by relativistic many-body theory