Separated oscillatory-field microwave measurement of the fine-structure interval of atomic helium
Physical Review A—Atomic, Molecular, and Optical Physics, 2009•APS
The 2 P 3 1–2 P 3 2 interval in helium is measured using microwave separated oscillatory
fields. Our measured result is 2 291 177.53±0.35 kHz. A disagreement with theory of over 15
kHz indicates a major problem with two-electron QED calculations. If this disagreement is
resolved, measurements of both 2 P 3 fine-structure intervals at this accuracy would lead to
a six-parts-per-billion determination of the fine-structure constant.
fields. Our measured result is 2 291 177.53±0.35 kHz. A disagreement with theory of over 15
kHz indicates a major problem with two-electron QED calculations. If this disagreement is
resolved, measurements of both 2 P 3 fine-structure intervals at this accuracy would lead to
a six-parts-per-billion determination of the fine-structure constant.
The interval in helium is measured using microwave separated oscillatory fields. Our measured result is . A disagreement with theory of over 15 kHz indicates a major problem with two-electron QED calculations. If this disagreement is resolved, measurements of both fine-structure intervals at this accuracy would lead to a six-parts-per-billion determination of the fine-structure constant.
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