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arXiv · 2502.19010

Phase evolution of strong-field ionization

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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Abstract

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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Lynda R Hutcheson, Maximilian Hartmann, Gergana D Borisova, Paul Birk, Shuyuan Hu, Christian Ott, Thomas Pfeifer, Hugo W van der Hart, Andrew C Brown. 2025-02-26. Phase evolution of strong-field ionization. https://doi.org/10.1103/physrevresearch.7.l022074

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