Reconstruction of attosecond beating by interference of two-photon transitions
= Reconstruction of attosecond beating by interference of two-photon transitions
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= RABBITT
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<RABBITT> measures adjacent harmonic <spectral phases> through two-photon <photoionization>. A weak delayed <infrared> reference opens two interfering paths to a shared <photoelectron> <energy>; the <two-path attosecond phase reconstruction> spells out the inference.