The sixth spectrum of uranium (U VI) between 80 and 115 nm is studied by observation of transitions following low-energy electron capture by a U<sup>6+</sup>-ion beam in a H<sub>2</sub> gas target. Emission cross sections of several identified transitions are obtained, the energy dependence investigated, and the spectra compared with the predictions of single-configuration Dirac–Fock (SCDF) calculations. Based on tentative identifications, a Rydberg–Ritz parameterization yields a predicted ionization potential only 0.3% above the SCDF result.
© 1992 Optical Society of America
D. A. Church, M. Druetta, R. Dunford, C.-J. Liu, C. Froese-Fischer, M. Idrees, and V. M. Umar, "Collision spectroscopy of low-energy-beam U5+ ions," J. Opt. Soc. Am. B 9, 2159-2162 (1992)