AI 中文总结
介绍一种通过光剥离中和负离子产生仅含基态原子的原子束用于共线激光光谱的方法，以负硼离子束为测试，虽现有条件下统计和效率受限，但给出改进途径，可用于其他元素及负分子离子。
AI 中文摘要
用于共线激光光谱的原子束通常通过束内蒸气室中的电荷交换反应产生。此过程伴随着大量长寿命激发态粒子的形成，这对光谱分析不可用且会给光子探测器带来荧光背景。我们提出一种仅由基态原子组成的原子束产生方法。负离子通过光剥离在飞行中被中和，随后用于荧光光谱分析。以负硼离子束为测试对象，在铯溅射源中产生并与同向传播的高功率脉冲红外激光叠加。中性原子随后被约250nm的连续波激光沿特定跃迁激发。虽受限于连续离子束与低重复率激光的组合导致统计和效率受限，但给出了结合现有技术改进的清晰途径，可应用于其他元素及负分子离子。
英文摘要
Atomic beams for collinear laser spectroscopy are typically produced via charge exchange reactions in an in-beam vapor cell. This process is accompanied by the formation of a considerable amount of longer-lived excited state population, which is not accessible for spectroscopy and also induces fluorescence background to photon detectors. We present an alternative method to produce an atomic beam, consisting exclusively of ground-state atoms. Negative ions are neutralized in-flight by photodetachment and are subsequently used for fluorescence spectroscopy. As a test candidate, a negative boron ion beam was produced in a cesium sputtering source and superimposed with a co-propagating high-power pulsed infrared laser. The neutral atoms were subsequently excited along the $2s^2 2p\,{}^{2\!}P_{1/2,3/2} \rightarrow 2s^2 3s\,{}^{2\!}S_{1/2}$ transitions by a continuous-wave laser at about 250 nm. The statistics and efficiency were limited by the combination of a continuous ion beam with a low-repetition-rate laser, but a clear route for the improvement combining existing techniques is presented, which can then be applied to other elements as well as negative molecular ions.
Comments8 pages, 5 figures
