SAMOP 2021 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 7: Attosecond physics
A 7.1: Poster
Dienstag, 21. September 2021, 16:30–18:30, P
Time Delay and Nonadiabatic Calibration of the Attoclock — •Ossama Kullie — University of Kassel
The 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 [1] that our real tunneling time approach fits well to the experimental data of the attoclock. In the present work [2], we show that our model can explain the experimental results in the nonadiabatic field calibration, where we reach a good agreement with the experimental data of Hofmann et al. (J. of Mod. Opt. 66, 1052, 2019). Moreover, our result is confirmed by the numerical integration of the time-dependent Schrödinger equation of Ivanov et al. (Phys. Rev. A 89, 021402, 2014). Our model is appealing because it offers a clear picture of the multiphoton and tunneling parts. In the nonadiabatic case, the barrier region itself is mainly driven by multiphoton absorption, where the number of the absorbed photons to be characterized by the barrier height. Surprisingly, at a field strength F < Fa (the atomic field strength) the model always indicates a time delay with respect to the lower quantum limit at F=Fa. [1] O. Kullie, PRA 92, 052118 (2015), J. Phys. B 49 , 095601 (2016). [2] O. Kullie, submitted .... (2021), arXiv:2005.09938.