Cryogenic atomic hydrogen beam apparatus with velocity characterization
Cryogenic atomic hydrogen beam apparatus with velocity characterization
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DOI：
10.1063/1.5129156
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发表时间：
2020-01-01
影响因子：
1.6
通讯作者：
Yost, D. C.
中科院分区：
文献类型：
--
作者：
Cooper, S. F.;Brandt, A. D.;Yost, D. C.
氢的精密光谱学往往依赖于热流原子束，而热流原子束速度分布的不确定性会导致系统误差和线形模型的复杂化。在这里，我们提出了一种装置，能够使用简单的飞行时间技术对基态（1S）和亚稳态（2S）氢在低温下的速度分布进行高信噪比研究。我们还研究了低温喷嘴几何形状如何影响这些结果。
Precision spectroscopy of hydrogen often relies on effusive thermal atomic beams, and the uncertainty in the velocity distribution of these beams can introduce systematic errors and complicate lineshape models. Here, we present an apparatus capable of high signal-to-noise studies of these velocity distributions at cryogenic temperatures for both ground state (1S) and metastable (2S) hydrogen using a simple time-of-flight technique. We also investigate how the cryogenic nozzle geometry affects these results.