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Sub-cycle time resolution of multi-photon momentum transfer in strong-field ionization

Author

Listed:
  • Benjamin Willenberg

    (ETH Zurich)

  • Jochen Maurer

    (ETH Zurich)

  • Benedikt W. Mayer

    (ETH Zurich)

  • Ursula Keller

    (ETH Zurich)

Abstract

During multi-photon ionization of an atom it is well understood how the involved photons transfer their energy to the ion and the photoelectron. However, the transfer of the photon linear momentum is still not fully understood. Here, we present a time-resolved measurement of linear momentum transfer along the laser pulse propagation direction. We can show that the linear momentum transfer to the photoelectron depends on the ionization time within the laser cycle using the attoclock technique. We can mostly explain the measured linear momentum transfer within a classical model for a free electron in a laser field. However, corrections are required due to the parent-ion interaction and due to the initial momentum when the electron enters the continuum. The parent-ion interaction induces a negative attosecond time delay between the appearance in the continuum of the electron with minimal linear momentum transfer and the point in time with maximum ionization rate.

Suggested Citation

  • Benjamin Willenberg & Jochen Maurer & Benedikt W. Mayer & Ursula Keller, 2019. "Sub-cycle time resolution of multi-photon momentum transfer in strong-field ionization," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13409-6
    DOI: 10.1038/s41467-019-13409-6
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