Sheldon R E, Babij T J, Reeder S H, Hogan S D, Cassidy D B
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
Phys Rev Lett. 2023 Jul 28;131(4):043001. doi: 10.1103/PhysRevLett.131.043001.
We report the results of a new measurement of the positronium 2 ^{3}S_{1}→2 ^{3}P_{2} (ν_{2}) interval. Using a modified experimental arrangement we have significantly reduced the effects of microwave reflections, which in previous experiments resulted in shifts and asymmetric line shapes. With the improved apparatus we obtain an experimental value of ν_{2}=8627.94±0.95 MHz, which is within 1.3σ of the theoretical value 8626.71±0.08 MHz.
我们报告了对正电子素2 ³S₁→2 ³P₂（ν₂）间隔进行新测量的结果。通过使用改进的实验装置，我们显著降低了微波反射的影响，在之前的实验中，微波反射会导致频率偏移和不对称的线形。使用改进后的仪器，我们得到ν₂的实验值为8627.94±0.95 MHz，该值在理论值8626.71±0.08 MHz的1.3σ范围内。
