The spectrum of rhenium was observed in the (500–2100) Å wavelength region. The (5d⁴ + 5d³6s) − 5d³6p transition array of three times ionized rhenium, Re IV, has been investigated and 975 spectral lines have been classified in the region of (786–2063) Å. The analysis has led to the determination of the 5d⁴, 5d³6s and 5d³6p configurations. Thirty two of 34 theoretically possible 5d⁴ levels, 33 of 38 possible 5d³6s levels and 95 of 110 possible 5d³6p levels have been established. The orthogonal operators technique was used to calculate the level structure and transition probabilities. The energy parameters have been determined by the least squares fit to the observed levels. Calculated transition probability and energy values, as well as LS-compositions obtained from the fitted parameters are presented.

在（500–2100）Å波长区域观察到of的光谱。研究了三倍电离rh Re（IV ）的（5d ⁴  + 5d ³ 6s）-5d ³ 6p过渡阵列，并在（786–2063）Å区域对975条谱线进行了分类。该分析导致了测定5d的⁴，图5D ^3个6S和5d ³ 6P配置。34个理论上可能的5d ⁴水平中的32个，38个可能的5d ³ 6s水平中的33个和110个可能的5d ³水平中的95^个已经建立了6p级别。正交算子技术用于计算级别结构和转移概率。能量参数已通过最小二乘方确定为所观察到的水平。给出了计算的跃迁概率和能量值，以及从拟合参数中获得的LS组成。