Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 2: Attosecond physics I

A 2.8: Talk

Monday, March 9, 2020, 13:00–13:15, f107

Ionization time in the nonadiabatic attoclock, Multiphoton process versus tunneling in strong field interaction — •Ossama Kullie — Institute of Physics, Department of Mathematics and Natural Science, University of Kassel.

The measurement of the tunneling time in attosecond experiments, termed attoclock, triggered a hot debate about the tunneling time and the separation into two regimes of ionization, the multiphoton and the tunneling. In the adiabatic field calibration, we showed in earlier works [1] that our real tunneling time fits well in the experimental data of the attoclock. However, Hofmann et al (J. of Mod. Opt. 66, 1052, 2019), presented a new experimental data of the attoclock with a nonadiabtic calibration of the field strength. In the present work we show that our model is capable to account for the nonadiabaticity and we find an excellent agreement with the nonadiabatic experimental attoclock result of Hofmann et al. Interestingly, we show that our model offers a clear picture for the multiphoton and tunneling parts, and the well known regime separation is now resolved. In particular the the tunneling part is equalized by the nonadiabaticity, the absorption of n(F) photons (where F is the peak of field strength, and the time delay is ionization time delay with respect to the atomic field strength, where the Barrier suppression ionization sets up. [1] O. Kullie, Phys. Rev. A. 92, 052118 (2015), J. Phys. B 49, 095601 (2016), J. Phys. Commun. 2, 065001 (2018)