RELATIVISTIC EFFECTS ON THE BONDING OF HEAVY AND SUPERHEAVY HYDROGEN HALIDES

The bonding in the hydrogen halides HI, HAt and HUus (Uus = element 11 7) has been studied using four-component Dirac-Hartree-Fock calculatio ns and finite basis sets, The calculations show that the effect of spi n-orbit splitting on the valence p-orbital dominates the bonding for t he compound of the superheavy element, and even for the sixth row the spin-orbit interaction should be treated self-consistently for an accu rate description of the electronic structure.