Observation of asymmetric line shapes in precision microwave spectroscopy of the positronium () fine-structure intervals
Physical Review A, 2021•APS
We report new measurements of the positronium (Ps) 2 S 1 3→ 2 PJ 3 fine-structure
intervals, ν J (J= 0, 1, 2). In the experiments, Ps atoms, optically excited to the radiatively
metastable 2 S 1 3 level, flew through microwave radiation fields tuned to drive transitions to
the short-lived 2 PJ 3 levels, which were detected via the time spectrum of subsequent
ground-state Ps annihilation radiation. Both the ν 1 and ν 2 line shapes were found to be
asymmetric, which, in the absence of a complete line-shape model, prevents accurate …
intervals, ν J (J= 0, 1, 2). In the experiments, Ps atoms, optically excited to the radiatively
metastable 2 S 1 3 level, flew through microwave radiation fields tuned to drive transitions to
the short-lived 2 PJ 3 levels, which were detected via the time spectrum of subsequent
ground-state Ps annihilation radiation. Both the ν 1 and ν 2 line shapes were found to be
asymmetric, which, in the absence of a complete line-shape model, prevents accurate …
We report new measurements of the positronium (Ps) fine-structure intervals, (). In the experiments, Ps atoms, optically excited to the radiatively metastable level, flew through microwave radiation fields tuned to drive transitions to the short-lived levels, which were detected via the time spectrum of subsequent ground-state Ps annihilation radiation. Both the and line shapes were found to be asymmetric, which, in the absence of a complete line-shape model, prevents accurate determination of these fine-structure intervals. Conversely, the line shape did not exhibit any significant asymmetry; the observed interval, however, was found to disagree with QED theory by 4.2 standard deviations.
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