Theoretical and experimental binding energies for the d7s2 4F levels in Ru-, including calculated hyperfine structure and M1 decay rates

Relativistic configuration interaction (RCI) calculations predict that the 4d75s22J=9, 7, 5 and 3 4F levels of Ru- are all bound with binding energies 1.076, 0.905, 0.795, and 0.725 eV, respectively. Using laser photodetachment threshold spectroscopy, the binding energies of the 2J=9 and 2J=7 levels are measured to be 1.04638(25) and 0.8653(10) eV, respectively, in good agreement with the calculated values. Hyperfine structure constants for all …