Ab initio calculations of the 33S 3p4 3PJ and 33S− / 37,35Cl 3p5 2P oJ hyperfine structures.

Abstract. We present highly correlated multi-configuration Hartree-Fock (MCHF) calculations of the hyperfine structure of the 3p5 2P oJ levels of 33S − and 35,37Cl. We obtain a good agreement with observation. The hyperfine structure of the neutral sulfur 33S 3p4 3PJ lowest multiplet that has never been measured to the knowledge of the authors, is also estimated theoretically. We discuss some interesting observations made on the description of the atomic core in MCHF theory