Precise spectroscopic measurements of isotope shift (IS), Δσ (¹⁶⁰Dy - ¹⁶⁴Dy) have been carried out in the 258 atomic emission lines of neutral dysprosium covering 555–833 nm wavelength region, of which IS data for 198 lines is being reported for the first time. The present measurements have contributed significantly to understanding the complex Dy I atomic structure, which enabled us to report the level isotope shift, ΔT (¹⁶⁰Dy - ¹⁶⁴Dy) for 100 even- parity and 82 odd- parity energy levels out of which ΔT (¹⁶⁰Dy - ¹⁶⁴Dy) values for 45 even- and 36 odd- parity levels are new. Earlier tentative assignments of 15 even levels to 4f⁹5d6s6p and 5 even- levels to 4f¹⁰6s6d configuration have been confirmed in the present study. New configuration assignments have been made to 10 even levels and also 5 each assigned to 4f⁹5d6s6p and 4f¹⁰6s6d configurations. The validity of 10 odd-parity energy levels theoretically assigned earlier to the mixed (4f⁹5d6s²+4f¹⁰6s6p+4f⁹5d²6s) configurations has been verified using newly derived experimental level isotope shifts, ΔT (¹⁶⁰Dy-¹⁶⁴Dy) values. Tentative assignments of 4f¹⁰5d6p configuration confirmed for the 5 odd levels lying between 35029.50 cm⁻¹ (J=8) - 37836.50 cm⁻¹ (J=9). The present investigations have led to the first identification of two almost pure levels of 4f¹⁰5d6p configuration at 35777.79 cm⁻¹ (J=8) and 36260.17 cm⁻¹ (J=9). The ΔT (¹⁶⁰Dy- ¹⁶⁴Dy) values for 2 levels of 4f¹⁰6s7p configuration have been evaluated by us for the first time, whose configuration assignments have been confirmed presently.

已经在覆盖 555-833 nm 波长区域的中性镝的 258 条原子发射谱线中进行了同位素位移 (IS)、Δσ ( ¹⁶⁰ Dy - ¹⁶⁴ Dy) 的精确光谱测量，其中 198 条谱线的 IS 数据正在报告中第一次。目前的测量对理解复杂的 Dy I 原子结构做出了重大贡献，这使我们能够报告100 个偶数和 82 个奇数能级的能级同位素位移 ΔT ( ¹⁶⁰ Dy - ¹⁶⁴ Dy)，其中 ΔT ( ¹⁶⁰ Dy - ¹⁶⁴ Dy) 45 个偶数和 36 个奇数级的值是新的。早期的 15 个偶数级别暂定分配给 4f ⁹5d6s6p 和 5^个偶数水平到 4f ¹⁰ 6s6d 配置已在本研究中得到证实。新的配置分配已分配给 10 个偶数级别，并且每个级别分配了 5 个配置给 4f ⁹ 5d6s6p 和 4f ¹⁰ 6s6d 配置。已使用新推导出的实验能级同位素位移 ΔT ( ¹⁶⁰ Dy- ¹⁶⁴ Dy ) 验证了^{10 个}早期理论上分配给混合 (4f ⁹ 5d6s ² +4f ¹⁰ 6s6p+4f ⁹ 5d ² 6s) 配置的奇偶能级的有效性) 值。4f ¹⁰ 5d6p 配置的初步分配确认了位于 35029.50 cm 之间的 5 个奇数级别^-1 (J=8) - 37836.50 厘米^-1 (J=9)。目前的研究导致首次在 35777.79 cm ^-1 (J=8) 和 36260.17 cm ^-1 (J=9)处发现了两个几乎纯的 4f ¹⁰ 5d6p 配置水平。我们首次评估了4f ¹⁰ 6s7p 配置的2 个水平的 ΔT ( ¹⁶⁰ Dy- ¹⁶⁴ Dy) 值，其配置分配目前已得到确认。