Radio-Frequency Atomic Beam Measurement of the(2S122,F=0)-(2P122,F=1)Lamb-Shift Interval in Hydrogen

The $(2\mathrm{}{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{},F=0)$-$(2\mathrm{}{}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{},F=1)$ interval in atomic hydrogen has been measured in zero magnetic field by scanning a radio-frequency perturbation through the atomic resonance. The measured interval was found to be 909.904 ± 0.020 MHz, which is consistent with that reported by Lundeen and Pipkin, 909.940 ± 0.020 MHz. Our deduced value of the Lamb shift 1057.862 ± 0.020 MHz is in good agreement with Mohr's calculated value 1057.864 ± 0.014 MHz but not with Erickson's value of 1057.912 ± 0.011 MHz.