Abstract
We have designed and developed a laser-microwave triple resonance spectroscopy experiment of antiprotonic helium to investigate its hyperfine (HF) and superhyperfine (SHF) structures. We succeeded in making microwave transitions between HF substates of the ( n, l) = (37, 35) metastable state, and resolved doublet resonance peaks split by SHFS. We determined the resonance frequencies with 30ppm precision. The experimental values agree with recent theoretical calculations, and to ∼ 60ppm level three-body QED theory is verified.
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