Inner-shell photodetachment from Ru-
Abstract
Inner-shell photodetachment from Ru- was studied near and above the 4p excitation region, 29-to-91-eV photon energy range, using a merged ion-photon-beam technique. The absolute photodetachment cross sections of Ru- ([Kr]4d75s2) leading to Ru+, Ru2+, and Ru3+ ion production were measured. In the near-threshold region, a Wigner s-wave law, including estimated postcollision interaction effects, locates the 4p3/2 detachment threshold between 40.10 and 40.27 eV. Additionally, the Ru2+ product spectrum provides evidence for simultaneous two-electron photodetachment (likely to the Ru+ 4p54d65s2 state) located near 49 eV. Resonance effects are observed due to interference between transitions of the 4p electrons to the quasibound 4p54d85s2 states and the 4d→ɛf continuum. Despite the large number of possible terms resulting from the Ru- 4d open shell, the cross section obtained from a 51-state LS-coupled R-matrix calculation agrees qualitatively well with the experimental data.
- Publication:
-
Physical Review A
- Pub Date:
- October 2010
- DOI:
- 10.1103/PhysRevA.82.043434
- Bibcode:
- 2010PhRvA..82d3434D
- Keywords:
-
- 32.80.Gc;
- 32.80.Aa;
- 32.70.Fw;
- 32.30.Rj;
- Photodetachment of atomic negative ions;
- Inner-shell excitation and ionization;
- Absolute and relative intensities;
- X-ray spectra