Spectrum and Energy Levels of Five-Times Ionized Zirconium (Zr VI)
Joseph Reader, Mark D. Lindsay
The spectrum of five-times-ionized zirconium Zr VI was observed from 160 Å to 2000 Å with sliding spark discharges on 10.7-m normal- and grazing-incidence spectrographs. The existing analysis of this spectrum [Khan Z. A. et al. 1985 Phys. Scr. 31 837] was significantly revised. There are now 418 lines classified as transitions between 23 levels of even parity and 73 levels of odd parity. The 4s24p5, 4s4p6, 4s24p44d, 5s, 5d, 6s configurations are now complete, although a few levels of 4s24p45d are tentative. From the optimized energy level values, Ritz-type wavelengths were determined for 135 lines, with uncertainties varying from 0.0003 Å to 0.002 Å. The observed configurations were theoretically interpreted by means of Hartree-Fock calculations and least-squares fits of the energy parameters to the observed levels. The fitted parameters were used to calculate oscillator strengths for all classified lines. The ionization energy was revised to 777380±290 cm-1 (96.38±0.04 eV).
and Lindsay, M.
Spectrum and Energy Levels of Five-Times Ionized Zirconium (Zr VI), Physica Scripta, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918722
(Accessed April 22, 2021)