The spectrum of Praseodymium was investigated in the visible region from 4000 Å to 7500 Å based on previously recorded Fourier Transform spectra. Source of free Pr atoms was a hollow cathode discharge lamp. The investigation of spectral lines was performed using laser-induced fluorescence spectroscopy. A tunable single mode ring-dye laser, pumped by a frequency doubled Nd-YAG laser, was used as the light source to investigate selected lines. Hyperfine spectra of 129 lines were recorded and the magnetic dipole hyperfine structure constants of the involved energy levels were determined. This led to the discovery of up to now unknown levels. In this paper, 30 even parity levels, having J-values of 1/2, 3/2, and 5/2 are presented. The existence of all levels is confirmed by several laser excitations in the spectral range of our dye laser.

根据先前记录的傅立叶变换光谱，研究了Pra在4000Å至7500Å可见光范围内的光谱。游离Pr原子的来源是空心阴极放电灯。光谱线的研究是使用激光诱导荧光光谱法进行的。由倍频Nd-YAG激光器泵浦的可调谐单模环形染料激光器用作光源，以研究选定的谱线。记录了129条线的超精细光谱，并确定了所涉及能级的磁偶极超精细结构常数。这导致发现了迄今为止未知的水平。在本文中，提出了30个偶数奇偶校验级别，它们的J值分别为1 / 2、3 / 2和5/2。在我们的染料激光器的光谱范围内，通过几次激光激发，证实了所有能级的存在。