We report energy level structure of triply ionized mercury (Hg IV). The spectrum was recorded on a 3-m normal incidence vacuum spectrograph in the wavelength region 300 – 2000 Å, using a triggered spark source at the spectroscopy laboratory, St. Francis Xavier University, Antigonish in Canada. Wavelength measurement and the corresponding uncertainties caused by calibration procedures are carefully analyzed. Based on the analysis of original measurements, the energy levels are optimized, which resulted in an improved set of energy level values. A complete disentanglement of the origin of these energy levels may well be impossible; therefore, new configurations have been extended in our theoretical calculations using Cowan's pseudo-relativistic Hartree-Fock code with superposition of interacting configurations. All preceding results were confirmed, and the 5d⁸(6d + 7s) mixed configurations have been newly established with the aid of experimental data supported by theoretical calculations. Along with the optimized energy eigenvalues, the observed and Ritz wavelengths, transition rates, and eigenvector compositions of Hg IV are also given. The energy level values were optimized using a computer code LOPT.

我们报告了三重离子化汞（Hg IV）的能级结构。光谱是在加拿大安蒂哥尼什的圣弗朗西斯·泽维尔大学光谱实验室使用触发火花源在波长范围300 – 2000Å的3-m正入射真空光谱仪上记录的。仔细分析了波长测量和由校准程序引起的相应不确定性。在对原始测量值进行分析的基础上，优化了能级，从而改进了能级值集。完全不可能完全消除这些能级的起源。因此，在我们的理论计算中，使用Cowan的伪模型扩展了新的配置相对论的Hartree-Fock代码与交互配置的叠加。之前的所有结果均得到确认，并借助理论计算支持的实验数据，新建立了5d ⁸（6d + 7s）混合构型。连同优化的能量本征值，还给出了Hg IV的观测波长和Ritz波长，跃迁速率和本征向量组成。使用计算机代码LOPT优化能级值。