Polarization dependence of n=2 positronium transition rates to Stark-split n=30 levels via crossed-beam spectroscopy
Polarization dependence of n=2 positronium transition rates to Stark-split n=30 levels via crossed-beam spectroscopy
复制标题
DOI：
10.1088/0953-4075/49/6/064006
复制
发表时间：
2016-03-28
影响因子：
1.6
通讯作者：
Mills, A. P., Jr.
中科院分区：
文献类型：
--
作者：
Jones, A. C. L.;Hisakado, T. H.;Mills, A. P., Jr.
我们通过两步激光激发从1（3）S → 2（3）P和从2（3）P到主量子能级n = 30 +/- 1的态产生了Rydberg Ps，这些态被运动诱导电场Stark分裂。我们的测量在很大程度上是免费的一阶多普勒频移，使我们能够调查的影响，激光偏振的人口密集的斯塔克水平。我们发现的分布，主要取决于IR激光偏振相对于运动诱导电场的方向的变化。对于平行于电场F偏振的IR光，与激发到最小斯塔克分裂状态的激发概率相比，激发到最大斯塔克分裂水平的概率的比率被发现为3.37 +/- 0.51，而对于垂直于F偏振的IR光，激发比率为0.87 +/- 0.64。我们的结果与Wall等人（2015 Phys. Rev. Lett. 114 173001）获得的n = 11，将是有用的准备高n态的Ps的各种实验，包括测量的相互作用的Ps与重力，在精密飞行时间（TOF）的能量光谱，精密光学光谱的Ps。
We produce Rydberg Ps by a two-step laser excitation from 1(3)S -> 2(3)P and from 2(3)P to states of principal quantum level n = 30 +/- 1 that are Stark split by a motionally induced electric field. Our measurements are largely free of first-order Doppler shifts such that we are able to investigate the impact of laser polarization on the population of the closely spaced Stark levels. We find a variation in the distribution that is primarily dependent on the IR laser polarization with respect to the direction of the motionally induced electric field. With the IR light polarized parallel to the electric field F, the ratio of excitation probability to the levels of maximal Stark splitting compared to that of excitation to the states of minimal Stark splitting is found to be 3.37 +/- 0.51, whereas with the IR light polarized perpendicular to F, the excitation ratio is 0.87 +/- 0.64. Our results agree with those of Wall et al (2015 Phys. Rev. Lett. 114 173001) obtained with n = 11 and will be useful in the preparation of high-n states of Ps for a variety of experiments, including measuring the interaction of Ps with gravity, in precision time-of-flight (TOF) energy spectroscopy, and precision optical spectroscopy of Ps.