Abstract
New experimental results for the 2s hyperfine interval in hydrogen and deuterium have been obtained by optical frequency measurement of the 1s2s two-photon transition for different spin states in a zero magnetic field. The accuracy exceeds that of earlier microwave measurements. Together with the precisely known ground-state hyperfine splitting, we obtain a value of D21 = 8vhfs(2s) vhfs(1s), which permits a test of quantum electrodynamics without suffering from large unknown nuclear structure effects. The theory of D21 in hydrogen and deuterium is also presented in this paper. PACS Nos.: 12.20Fv, 32.10Fn, 32.30Jc, 42.62Fi
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