In this work we propose an experimental apparatus to investigate the isotope shift using two sub-Doppler techniques: Intermodulated Laser Induced Fluorescence and Intermodulated Optogalvanic Spectroscopy. The experimental set uses a portable hollow cathode lamp, which is an atomic source less expensive and simpler when compared to other techniques e.g. atomic beam. The method was applied to the erbium rare earth, being possible to observe the isotope shift for three transitions from the ground state: 0 → 17,347.860 cm⁻¹ (576.440 nm), 0 → 17,157.307 cm⁻¹ (582.842 nm) and 0 → 17,073.800 cm⁻¹ (585.695 nm). The experimental erbium data from the literature were used to perform simulations of spectra in order to compare and confirm the accuracy of our measurements.

在这项工作中，我们提出了一种使用两种亚多普勒技术研究同位素位移的实验设备：互调激光诱导荧光和互调光电谱。该实验装置使用便携式空心阴极灯，与其他技术（例如原子束）相比，它是一种原子源，价格便宜且简单。该方法应用于to稀土，可以观察到从基态开始的三个跃迁的同位素位移：0→17,347.860 cm ^-1（576.440 nm），0→17,157.307 cm ^-1（582.842 nm）和0→17,073.800 cm ^-1（585.695 nm）。来自文献的实验数据用于进行光谱模拟，以便比较和确认我们的测量准确性。