Relativistic effects in the photoelectron angular distribution of $s$-states of superheavy elements

The influence of relativistic effects on the electronic structure of heavy and superheavy atoms has been discussed [1,2]. However, the effect of relativity on photoionization dynamics from these elements is seldom studied. The angular distribution of photoelectrons is known to be sensitive to relativistic effects [3]. In the present work, the relativistic-random-phase approximation (RRPA) [4] at different levels of truncation is employed to find the relativistic and correlation effects in the angular distribution of photoionization from \textit{ns} subshells of superheavy elements up to Z$=$118. We find that relativistic interactions in the final continuum states are strong enough to engender a substantial of the value of the dipole angular distribution $\beta $ parameter from its non-relativistic value of 2. Z$=$118 is a homologue of Rn and a qualitative comparison is made with photoelectron angular distribution of Rn [7], in which the relativistic effects are smaller relative to Z-118. [1] P. Pyykko, Adv. Chern. Res. \textbf{11}, 353 (1978); [2] \textit{Relativistic Effects in Atoms, Molecules, and Solids}, edited by G. L. Malli (Plenum, New York, 1983); [3]S. T. Manson and A. F. Starace, Rev. Mod. Phys. \textbf{54}, 389 (1982); [4]W. R. Johnson and C. D. Lin, Phys. Rev. A \textbf{20}, 964 (1979); [5] V. Pershina \textit{et al}, J. Chem. Phys. \textbf{129}, 144106 (2008); [6] E. Eliav \textit{et al}, Phys. Rev. Lett. \textbf{77}, 5350 (1996); P. C. Deshmukh, V. Radojevic, and S. T, Manson, Phys. Rev. A \textbf{45}, 6339 (1992).