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We propose a new technique to fully characterize the temporal structure ofextreme ultraviolet pulses by ionizing a bound coherent electronic wavepacket.The populated energy levels make it possible to interfere different spectralcomponents leading to quantum beats in the photoelectron spectrum as a functionof the delay between ionization and initiation of the wavepacket. The influenceof the dipole phase, which is the main obstacle for state-of-the-art pulsecharacterization schemes, can be eliminated by angle integration of thephotoelectron spectrum. We show that particularly atomic Rydberg wavepacketsare ideal and that wavepackets involving multiple electronic states provideredundant information which can be used to cross-check the consistency of thephase reconstruction.

Attosecond pulse characterization with coherent Rydberg wavepackets