Four-times ionized cerium (Ce V) is isoelectronic with neutral xenon, having 5s²5p^{6 1}S₀, the only level in the ground configuration. Previously reported energy levels and line classifications of the 5s²5p⁵ (4f+5d+6d+6s and 6p) configurations were evaluated empirically by means of extended calculations and Boltzmann plots. Here, we have added a new configuration 5s5p⁶4f to the previously reported work. The spectrum was recorded on a 3 m normal incidence vacuum spectrograph in the 300–1240 Å region at the Antigonish laboratory (Canada). Theoretical calculations were performed using the pseudo-relativistic Hartree-Fock (HFR) configuration interaction method. The transition probabilities were calculated for the above-mentioned configurations. We also calculated the lifetimes of 5s²5p⁵4f metastable states using the MCDHF method.

四倍离子化铈（Ce V）与中性氙等离子，具有5s ² 5p ^{6 1} S ₀，这是接地构造中唯一的水平。以前报告的5s ² 5p ⁵（4f + 5d + 6d + 6s和6p）构型的能级和线分类是通过扩展计算和玻耳兹曼图进行经验评估的。在这里，我们添加了一个新的配置5s5p ⁶4f到以前报告的工作。光谱在安提哥尼实验室（加拿大）的300–1240Å区域的3 m正入射真空光谱仪上记录。理论计算是使用伪相对论的Hartree-Fock（HFR）配置相互作用方法进行的。计算上述配置的转移概率。我们还使用MCDHF方法计算了5s ² 5p ⁵ 4f亚稳态的寿命。