Phys. Rev. Lett. 39, 1070–1073 (1977)Choice of Gauge in Two-Photon Transitions: 1s-2s Transition in Atomic HydrogenReceived 25 May 1977; published in the issue dated 24 October 1977 The two-photon transition rate for hydrogen is evaluated with the E⃗·x⃗ and the A⃗·p⃗ interactions including the continuum. We find that the E⃗·x⃗ interaction approaches the final result with a small number of intermediate states and consequently is the one to be used in any approximate calculation. Numerical values of the two-photon absorption coefficient as a function of frequency are given and the resonance enhancement is exhibited. © 1977 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.39.1070
DOI:
10.1103/PhysRevLett.39.1070
PACS:
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