HYPERFINE-STRUCTURE CONSTANTS OF (D-I AND THE ZR-II AND HF-II ISOELECTRONIC-SEQUENCES(S)(3) STATES IN LA)

Accurate results for hyperfine structure (HFS) constants of (d + s)(n) states often require the inclusion of both correlation and relativist ic effects. Without these, Dirac-Fock HFS constants may have the wrong sign, the energies of uppermost d(n) levels may be wrong by over 1 eV . Here, we demonstrate that these problems persist well into an isoele ctronic sequence, and identify the principle configurations needed to achieve accurate results. (C) 1997 John Wiley & Sons, Inc.