ELEMENT-118 - THE FIRST RARE-GAS WITH AN ELECTRON-AFFINITY

The electron affinity of the rare gas element 118 is calculated by the relativistic coupled cluster method based on the Dirac-Coulomb-Breit Hamiltonian. A large basis set (34s26p20d14f9g6h4i) of Gaussian-type o rbitals is used. The external 40 electrons are correlated. Inclusion o f both relativity and correlation yields an electron affinity of 0.056 eV, with an estimated error of 0.01 eV. Nonrelativistic or uncorrelat ed calculations give no electron affinity for the atom.