National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Phys Rev Lett. 2011 Jul 8;107(2):023001. doi: 10.1103/PhysRevLett.107.023001. Epub 2011 Jul 6.
Optical frequencies of the D lines of (6,7)Li were measured with a relative accuracy of 5 × 10⁻¹¹ using an optical comb synthesizer. Quantum interference in the laser induced fluorescence for the partially resolved D2 lines was found to produce polarization dependent shifts as large as 1 MHz. Our results resolve large discrepancies among previous experiments and between all experiments and theory. The fine-structure splittings for ⁶Li and ⁷Li are 10052.837(22) MHz and 10053.435(21) MHz. The splitting isotope shift is 0.599(30) MHz, in reasonable agreement with recent theoretical calculations.
使用光学梳合成器，以 5×10⁻¹¹的相对精度测量了（6,7）Li 的 D 线的光频。发现激光诱导荧光中部分分辨的 D2 线的量子干涉会产生高达 1 MHz 的偏振相关位移。我们的结果解决了先前实验之间以及所有实验与理论之间的较大差异。⁶Li 和 ⁷Li 的精细结构分裂为 10052.837(22) MHz 和 10053.435(21) MHz。分裂同位素位移为 0.599(30) MHz，与最近的理论计算基本一致。
