Nagele, S., Pazourek, R., Feist, J., Doblhoff-Dier, K., Lemell, C., Tökési, K., & Burgdörfer, J. (2011). Time-resolved photoemission by attosecond streaking: extraction of time information. Journal of Physics B: Atomic, Molecular and Optical Physics, 44(8), 081001. https://doi.org/10.1088/0953-4075/44/8/081001
E134-01 - Forschungsbereich Applied and Computational Physics E136 - Institut für Theoretische Physik
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Journal:
Journal of Physics B: Atomic, Molecular and Optical Physics
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ISSN:
0953-4075
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Date (published):
11-Apr-2011
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Number of Pages:
6
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Publisher:
IOP PUBLISHING LTD
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Peer reviewed:
Yes
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Keywords:
Condensed Matter Physics; Atomic and Molecular Physics, and Optics
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Abstract:
Attosecond streaking of atomic photoemission holds the promise to provide unprecedented information on the release time of the photoelectron. We show that attosecond streaking phase shifts indeed contain timing (or spectral phase) information associated with the Eisenbud-Wigner-Smith time delay matrix of quantum scattering. However, this is only accessible if the influence of the streaking infrared (IR) field on the emission process is properly accounted for. The IR probe field can strongly modify the observed streaking phase shift. We show that the part of the phase shift ("time shift") due to the interaction between the outgoing electron and the combined Coulomb and IR laser fields can be described classically. By contrast, the strong initial-state dependence of the streaking phase shift is only revealed through the solution of the time-dependent Schrödinger equation in its full dimensionality. We find a time delay between the hydrogenic 2s and 2p initial states in He⁺ exceeding 20as for a wide range of IR intensities and XUV energies.