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MO: Fachverband Molekülphysik
MO 12: Interaction with Strong or Short Laser Pulses II (joint session A/MO)
MO 12.5: Talk
Wednesday, March 8, 2023, 15:45–16:00, F107
Delay time and Non-Adiabatic Calibration of the Attoclock.
Multiphoton process versus tunneling in strong field interaction — •Ossama Kullie1 and Igor Ivanov2 — 1Institute for Physics, University of Kassel — 2nstitute for Basic Science (IBS), Gwangju 61005, Republic of Korea
Recent measurement of the tunneling time in attosecond experiments (termed attoclock), triggered a hot debate about the tunneling time, the role of time in quantum mechanics and the separation of the interaction with the laser pulse into two regimes of a different character, the multiphoton and the tunneling (field-) ionization. In the adiabatic field calibration, we showed in earlier works (see e.g. [1]) that our real tunneling time model fits well to the experimental data. In the present work [2], we investigate the nonadiabatic case (see [3]) and combine it with a new result of a numerical integration of the TDSE (see [4]). Our model explains the experimental of Hofmann et al [3] with an excellent agreement. Our model is appealing because it offers a clear picture of the multiphoton and tunneling. In the nonadiabatic case, the barrier itself is mainly driven by multiphoton absorption and the number of the absorbed photons depends on the δ-value of the barrier height. Surprisingly, for a filed strength F<Fa (the atomic field strength) the model always indicates a time delay with respect to the lower quantum limit at F=Fa. Its saturation at the adiabatic limit explains the well-known Hartman effect or Hartman paradox. [1] O. kulllie. PRA 92 052118 (2015). [2] O. kulllie and I. Ivanov arxiv.2005.09938v4. [3] J. of Mod. Opt. 66, 1052, 2019. [4] Phys. Rev. A 89, 021402, 2014.