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Journal Article

Proper Time Delays Measured by Optical Streaking

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Saalmann,  Ulf
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Rost,  Jan M.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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2003.06172.pdf
(Preprint), 463KB

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Citation

Saalmann, U., & Rost, J. M. (2020). Proper Time Delays Measured by Optical Streaking. Physical Review Letters, 125(11): 113202. doi:10.1103/PhysRevLett.125.113202.


Cite as: https://hdl.handle.net/21.11116/0000-0007-CCC7-3
Abstract
In attosecond science it is assumed that Wigner-Smith time delays, known from scattering theory, are determined by measuring streaking shifts. Despite their wide use from atoms to solids this has never been proven. Analyzing the underlying process-energy absorption from the streaking light-we derive this relation. It reveals that only under specific conditions streaking shifts measure Wigner-Smith time delays. For the most relevant case, interactions containing long-range Coulomb tails, we show that finite streaking shifts, including relative shifts from two different orbitals, are misleading. We devise a new time-delay definition and describe a measurement technique that avoids the record of a complete streaking scan, as suggested by the relation between time delays and streaking shifts.