Phys. Rev. Lett. 24, 562–565 (1970)Order α2 Electrodynamic Corrections to the Lamb ShiftReceived 5 January 1970; published in the issue dated 16 March 1970 The fourth-order radiative correction to the slope at q2=0 of the Dirac form factor of the free-electron vertex is calculated using computer techniques. The result, m2∂F1(4)(0)/∂q2=(α/π)2[0.48±0.07], disagrees with previous calculations, and implies a new theoretical value for the order α2(Zα)4mc2 contribution to the Lamb shift. The new values for the 2S1/2-2P1/2 separation in H and D are increased by (0.35 ± 0.07) MHz and are in good agreement with the results of recent experiments. © 1970 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.24.562
DOI:
10.1103/PhysRevLett.24.562
PACS:
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