Journal
PHYSICAL REVIEW LETTERS
Volume 87, Issue 17, Pages -Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.87.173002
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The 2(3)P(1)-to-2(3)P(0) interval in atomic helium is measured using a thermal beam of metastable helium atoms excited to the 2(3)P state using a 1.08-mum diode laser. The 2(3)P(1)-to-P-23(0) transition is driven by 29.6-GHz microwaves in a rectangular waveguide cavity. Our result of 29616950.9 +/- 0.9 kHz is the most precise measurement of helium 2(3)P fine structure. When compared to precise theory for this interval, this measurement leads to a determination of the fine-structure constant of 1/137.035 986 4(31).
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