Abstract
Relativistic excitation energies and oscillator strengths are computed for both the resonance transition 6s2 1S0-6s6p 1P1 and the intercombination line 6s2 1S0-6s6p 3P1 in the mercury isoelectronic sequence. In the authors' approach to the correlation problem, limited relativistic configuration mixing which represents, intravalence correlation is combined with a polarisation model which accounts for valence-core correlation. Systematic trends along the sequence are discussed both the oscillator strengths and for contributions of intravalence and valence-core electron correlation. Theoretical ionisation potentials, corrected for relativistic and core polarisation effects, are predicted for 1S0, 3P1 and 1P1 states in the Po V, At VI and Rn VII spectra of the mercury sequence as well as for the 2S1/2 ground states in the Po VI, At VII and Rn VIII spectra of the gold isoelectronic sequence.
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