Reader Joseph, Lindsay Mark D
National Institute of Standards and Technology, Gaithersburg, MD 20899-8422, USA.
Phys Scr. 2016 Feb;91(2). doi: 10.1088/0031-8949/91/2/025401. Epub 2016 Jan 5.
We carried out a new analysis of the spectrum of five-times-ionized zirconium Zr VI. For this we used sliding-spark discharges together with normal- and grazing-incidence spectrographs to observe the spectrum from 160 to 2000 Å. These observations showed that the analysis of this spectrum by Khan Z. A. et al. 1985 837 contained a significant number of incorrect energy levels. We have now classified ∼420 lines as transitions between 23 even-parity levels 73 odd-parity levels. The 4s4p, 4s4p, 4s4p4d, 5s, 5d, 6s configurations are now complete, although a few levels of 4s4p5d are tentative. We determined Ritz-type wavelengths for ∼135 lines from the optimized energy levels. The uncertainties range from 0.0003 to 0.0020 Å. Hartree-Fock calculations and least-squares fits of the energy parameters to the observed levels were used to interpret the observed configurations. Oscillator strengths for all classified lines were calculated with the fitted parameters. The results are compared with values for the level energies, percentage compositions, and transition probabilities from recent theoretical calculations. The ionization energy was revised to 777380±300 cm (96.38±0.04 eV).
我们对五次电离锆Zr VI的光谱进行了新的分析。为此，我们使用滑动火花放电以及正入射和掠入射光谱仪来观测160至2000埃的光谱。这些观测结果表明，Khan Z. A.等人（1985年，837页）对该光谱的分析包含大量错误的能级。我们现已将约420条谱线归类为23个偶宇称能级和73个奇宇称能级之间的跃迁。4s4p、4s4p、4s4p4d、5s、5d、6s组态现已完整，不过4s4p5d的一些能级是暂定的。我们从优化后的能级确定了约135条谱线的里兹型波长。不确定度范围为0.0003至0.0020埃。使用哈特里 - 福克计算以及将能量参数对观测能级进行最小二乘法拟合来解释观测到的组态。用拟合参数计算了所有已分类谱线的振子强度。将结果与近期理论计算得到的能级值、百分比组成和跃迁概率值进行了比较。电离能修订为777380±300厘米⁻¹（96.38±0.04电子伏特）。
