Abstract
An empirical study of the mercury atom is reported. For the odd 6snp (n = 6-8), 6p' and 6s5f configurations, the levels are studied by the parametrical method with configuration interaction. Hyperfine structure and isotope shift parameters are determined for these configurations, taking into account second order hyperfine interaction effects. For the even 6snd (n = 6-8) configurations and the 199 and 201 isotopes an empirical study is made by diagonalizing the total (fine + hyperfine) hamiltonian, neglecting configuration interaction. The 6sns (n = 7-10) configurations are also considered. We discuss the electronic a6s factor and propose the value: a6s = 1.351 cm-1 for 199Hg.
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