Electron affinity of oganesson
M. Y. Kaygorodov, L. V. Skripnikov, I. I. Tupitsyn, E. Eliav, Y. S., Kozhedub, A. V. Malyshev, A. V. Oleynichenko, V. M. Shabaev, A. V. Titov, A., V. Zaitsevskii
TL;DR
This paper calculates the electron affinity of the superheavy element oganesson using advanced relativistic quantum methods, accounting for electron-electron interactions and QED corrections, resulting in a precise value.
Contribution
It applies relativistic Fock-space coupled cluster and configuration interaction methods with QED corrections to determine oganesson's electron affinity for the first time.
Findings
EA of Og is 0.076(4) eV
Results from two methods are consistent
QED corrections are significant for superheavy elements
Abstract
The electron affinity (EA) of superheavy element Og is calculated by the use of the relativistic Fock-space coupled cluster (FSCC) and configuration interaction methods. The FSCC cluster operator expansion included single, double, and triple excitations treated in a non-perturbative manner. The Gaunt and retardation electron-electron interactions are taken into account. Both methods yield the results that are in agreement with each other. The quantum electrodynamics correction to EA is evaluated using the model Lamb-shift operator approach. The electron affinity of Og is obtained to be 0.076(4) eV.
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