首次用亚太赫兹光直接测量正电子素超精细分裂
First direct measurement of positronium hyperfine splitting with sub-THz light
摘要：
电子偶素是研究束缚态QED的理想体系。正电子素的超精细分裂（Ps-HFS，约203 GHz）是一个重要的观测，但所有以前的测量Ps-HFS已间接测量塞曼分裂。磁场的均匀性可能存在未知的系统误差。我们正在尝试使用亚太赫兹辐射直接测量Ps-HFS。我们研制了一套在法布里-珀罗谐振腔中积累高功率（约10 kW）辐射的光学系统，并首次观测到了正电子素超精细跃迁。
英文摘要：
Positronium is an ideal system for the research of the bound state QED. The hyperfine splitting of positronium (Ps-HFS, about 203 GHz) is an important observable but all previous measurements of Ps-HFS had been measured indirectly using Zeeman splitting. There might be the unknown systematic errors on the uniformity of magnetic field. We are trying to measure Ps-HFS directly using sub-THz radiation. We developed an optical system to accumulate high power (about 10 kW) radiation in a Fabry-Pérot resonant cavity and observed the positronium hyperfine transition for the first time.
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