NUCLEAR HYPERFINE INTERACTIONS ON HG HALIDES
Where early experiments (Berkeley, Bonn) in the 1970s had failed, we have successfully made the first Perturbed Angular Correlations, PAC, nuclear hyperfine interactions experiments on the 5/2+ 197Hg state in free Hg-halide molecules. The use of linear molecules (HgX2, X = I, Cl, Br) allow very precise measurements of the quadrupole moments, Q, of Hg isotopes, which are currently applied in numerous material and soft matter/bio physics experiments tracking heavy metals, binding and dynamics. Such experiments also provide precise Q-values used in the refinement of nuclear fundamental theories. The data are still requiring final fitting including centrifugal stretching, vibrational excitation, quantum effects and nuclear recoil to compare with quantum chemistry calculations for Hg halides.