Resonance ionization mass spectroscopy using three-step photoionization (PI) schemes was employed to study the 642 nm transition of Lu I. Multimode tunable dye lasers were used in these studies to confirm the transition and further characterization of its hitherto unreported hyperfine structure. The hyperfine features of less abundant isotope 176Lu and hyperfine A constant of upper level of 642 nm line and its transition isotope shift were determined for the first time. New autoionization resonances of odd parity connecting from the upper level of this transition were explored in the range 48315 – 50940 cm−1.

中文翻译：

---

Lu I 在 642 nm 处跃迁的超精细结构及其在探索新的奇偶偶性自电离共振中的应用


使用三步光离子化 （PI） 方案的共振电离质谱法研究了 Lu I 的 642 nm 跃迁。在这些研究中使用了多模式可调谐染料激光器来确认其迄今为止未报道的超精细结构的跃迁和进一步表征。首次确定了丰度较低的同位素 176Lu 和 642 nm 线上能级的超精细 A 常数及其过渡同位素偏移。在 48315 – 50940 cm-1 范围内探索了从该跃迁的上层连接的奇数奇偶性的新自电离共振。