Efficient, high-resolution resonance laser ionization spectroscopy using weak transitions to long-lived excited states
Efficient, high-resolution resonance laser ionization spectroscopy using weak transitions to long-lived excited states
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DOI：
10.1103/physreva.95.032502
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发表时间：
2017-03-07
影响因子：
2.9
通讯作者：
Neyens, G.
中科院分区：
文献类型：
--
作者：
de Groote, R. P.;Verlinde, M.;Neyens, G.
对奇异放射性核的微小样品进行激光光谱研究需要非常有效的实验技术。此外，需要高分辨率以允许提取核结构信息。在这里，我们证明，通过使用弱原子跃迁，共振激光电离光谱实现所需的高效率（1%- 10%）和精度（线宽几十MHz）。我们说明实验和通过使用模拟如何实现窄的实验线宽和如何扭曲的共振电离光谱线的形状可以避免。电离激光脉冲相对于激发激光脉冲的延迟的作用是至关重要的：延迟电离步骤的使用允许最佳的分辨能力和线形状。如果中间能级具有至少为激发激光脉冲宽度量级的寿命，则保持高效率。描述这一过程的模型很好地再现了观察到的特征，并将有助于优化未来实验的条件。模拟代码可应要求提供给作者。
Laser spectroscopic studies on minute samples of exotic radioactive nuclei require very efficient experimental techniques. In addition, high resolving powers are required to allow extraction of nuclear structure information. Here we demonstrate that by using weak atomic transitions, resonance laser ionization spectroscopy is achieved with the required high efficiency ( 1%- 10%) and precision ( linewidths of tens of MHz). We illustrate experimentally and through the use of simulations how the narrow experimental linewidths are achieved and how distorted resonance ionization spectroscopy line shapes can be avoided. The role of the delay of the ionization laser pulse with respect to the excitation laser pulse is crucial: the use of a delayed ionization step permits the best resolving powers and line shapes. A high efficiency is maintained if the intermediate level has a lifetime that is at least of the order of the excitation laser pulse width. A model that describes this process reproduces well the observed features and will help to optimize the conditions for future experiments. The simulation code is available upon request to the authors.