Calculation of the spectra of the superheavy element Z=112

TL;DR

This paper presents ab initio relativistic calculations of the energy spectra of superheavy element Z=112, employing advanced quantum methods to improve accuracy and compare different electron treatment approaches.

Contribution

It introduces a combined relativistic Hartree-Fock, configuration interaction, and many-body perturbation theory approach for superheavy elements, comparing two electron treatment models.

Findings

Results agree with previous calculations for Z=112.

The two-electron and twelve-electron models yield comparable energy levels.

Validation against mercury calculations confirms method accuracy.

Abstract

Accurate ab initio calculations of the energy levels of the superheavy elements Z=112 are presented. Relativistic Hartree-Fock and configuration interaction methods are combined with the many-body perturbation theory to construct the many-electron wave function for valence electrons and to include core-valence correlations. Two different approaches in which the element is treated as a system with two or twelve external electrons above closed shells are used and compared. Similar calculations for mercury are used to control the accuracy of the calculations. The results are compared with other calculations.