Va. Dzuba et Gf. Gribakin, YB- 6P(1 2) - LOW-LYING SHAPE RESONANCE RATHER THAN A BOUND-STATE/, Journal of physics. B, Atomic molecular and optical physics, 31(11), 1998, pp. 483-487
Strong evidence against stability of the negative ion of ytterbium is
presented, and the prediction is made that the lowest negative ion sta
te Yb- 4f(14)6s(2)6p P-2(1/2) is a narrow shape resonance in the elect
ron-atom continuum at 20 meV. These results are obtained from the many
-body theory calculations with the electron-atom correlation potential
appropriately scaled to reproduce the experimental data for the isoel
ectronic neutral Lu and Ba-. They are in agreement with the recent tho
rough experimental investigation of Yb- by the Aarhus group.