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Relativistic and correlation effects in the photoionization dynamics of oganesson ( Z = 118 ) : Spin-orbit-interaction-activated interchannel coupling effects

2020; American Physical Society; Volume: 102; Issue: 2 Linguagem: Inglês

10.1103/physreva.102.022813

2469-9942

Jobin Jose, S. Baral, P. C. Deshmukh, Steven T. Manson,

Atomic and Molecular Physics

High-$Z$ atoms are excellent laboratories to study the combination of relativistic and many-electron correlation effects in electronic structure and dynamics. In the present work, the relativistic-random-phase approximation at different levels of truncation is employed to explore the final-state correlation effects in the photoelectron dynamics of the heaviest known element in the Periodic Table: oganesson (Og) with $Z=118$. The focus of this work is to illustrate the relativistic effects resulting from coupling different photoionization channels arising from spin-orbit split subshells, termed the spin-orbit-interaction-activated interchannel coupling effect. Comparison with the photoelectron dynamics of Rn on a qualitative level is also carried out, since Og is a homologue of Rn. The photoelectron dynamics of $7p,7s$, and $6d$ subshells are investigated and differences between Og and Rn, due to enhanced relativistic effects, are investigated.