Answers are grounded in this paper and cite their sources.
The hyperfine splittings of hydrogen and deuterium in the 1²S1/2 state have been remeasured by the atomic beam method. It is found that Δν(H)=(1420.40573±0.00005)×10⁶ invsec, Δν(D)=(327.384302±0.000030)×10⁶ invsec. The result for hydrogen is in agreement with a recent measurement of Wittke and Dicke. It is significant disagreement with an earlier atomic beam measurement.
No takes yet. Share an insight, caveat, or question.
P. Kusch (1955) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: