Papers › Phase evolution of strong-field ionization

Phase evolution of strong-field ionization

26 Feb 2025arXiv:2502.19010links table onlyarchive 2025-07-28

Lynda R Hutcheson, Maximilian Hartmann, Gergana D Borisova, Paul Birk, Shuyuan Hu, Christian Ott, Thomas Pfeifer, Hugo W van der Hart, Andrew C Brown

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We investigate the time-dependent evolution of the dipole phase shift induced by strong-field ionization (SFI) using attosecond transient absorption spectroscopy (ATAS) for time-delays where the pump-probe pulses overlap. We study measured and calculated time-dependent ATA spectra of the ionic 4d-5p transition in xenon, and present the time-dependent line shape parameters in the complex plane. We attribute the complex, attosecond-scale dynamics to the contribution of three distinct processes: accumulation of ionization, transient population, and reversible population of excited states arising from polarization of the ground state.

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