标题： 实验同位素位移的5 $^2S_{1/2}$状态和铷的低激发态 显示英文标题

标题： Experimental isotope shifts of the 5 $^2S_{1/2}$ state and low-lying excited states of Rb

摘要： 通过结合对$^{87}$Rb 电离能的最新精确测量以及电子和超精细结构的先前测量，可以确定 $^{85}\textrm{Rb}-^{87}\textrm{Rb}$同位素位移的准确值，该值对应于 5$^2S_{1/2}$基态。 反过来，与额外的光谱数据进行比较，首次能够评估低能激发态的同位素位移，大多数情况下精度约为 1 MHz。 在少数情况下，除了总位移外，还可以确定特定质量位移的贡献。 这些信息对于跃迁到里德伯态的光谱分析以及原子理论的测试特别有用。 显示英文摘要

摘要： By combining a recent precise measurement of the ionization energy of $^{87}$Rb with previous measurements of electronic and hyperfine structure, an accurate value for the $^{85}\textrm{Rb}-^{87}\textrm{Rb}$ isotope shift of the 5$^2S_{1/2}$ ground state can be determined. In turn, comparison with additional spectroscopic data makes it possible for the first time to evaluate isotope shifts for the low-lying excited states, accurate in most cases to about 1 MHz. In a few cases, the specific mass shift contribution can be determined in addition to the total shift. This information is particularly useful for spectroscopic analysis of transitions to Rydberg states, and for tests of atomic theory.