论文标题
直接测量禁止的$ 2^{3 \！} s_1 \ rightarrow 3^{3 \！} s_1 $ Atomic Transition在氦气中
Direct Measurement of the Forbidden $2^{3\!}S_1 \rightarrow 3^{3\!}S_1$ Atomic Transition in Helium
论文作者
论文摘要
我们介绍了高度禁止的$ 2^{3 \！} s_1 \ rightarrow 3^{3 \！} S_1 $原子过渡的检测，这是任何中性原子中观察到的最弱的过渡。我们对过渡频率，上层寿命和过渡强度的测量与已发表的理论值非常吻合，并且可以导致对QED贡献和不同QED框架的测试。为了测量如此弱的过渡，我们使用超电位亚稳态（$ 2^{3 \！} S_1 $）氦原子开发了两种方法：低背景直接检测激发的原子，然后衰减原子以对过渡频率和生命周期进行敏感性测量；以及脉冲原子激光加热测量，以确定过渡强度。这些方法可能会应用于其他原子，从而为寻找超弱化的过渡和精度计量学提供了新的工具。
We present the detection of the highly forbidden $2^{3\!}S_1 \rightarrow 3^{3\!}S_1$ atomic transition in helium, the weakest transition observed in any neutral atom. Our measurements of the transition frequency, upper state lifetime, and transition strength agree well with published theoretical values, and can lead to tests of both QED contributions and different QED frameworks. To measure such a weak transition, we developed two methods using ultracold metastable ($2^{3\!}S_1$) helium atoms: low background direct detection of excited then decayed atoms for sensitive measurement of the transition frequency and lifetime; and a pulsed atom laser heating measurement for determining the transition strength. These methods could possibly be applied to other atoms, providing new tools in the search for ultra-weak transitions and precision metrology.
