Frustrated tunneling dynamics in ultrashort laser pulses

• URL: http://arxiv.org/abs/2106.01082v2
• Date: Fri, 23 Jul 2021 11:08:20 GMT
• Title: Frustrated tunneling dynamics in ultrashort laser pulses
• Authors: Edvin Olofsson, Stefanos Carlstr\"om and Jan Marcus Dahlstr\"om
• Abstract summary: We study a model for frustrated tunneling ionization using ultrashort laser pulses. We employ the saddle point approximation to predict quasiclassical trajectories that are captured on Rydberg states. Our results show that improvements of the quasiclassical trajectories are in order for a quantitative model of frustrated tunneling ionizaiton.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study a model for frustrated tunneling ionization using ultrashort laser pulses. The model is based on the strong field approximation and it employs the saddle point approximation to predict quasiclassical trajectories that are captured on Rydberg states. We present a classification of the saddle-point solutions and explore their behavior as functions of angular momentum of the final state, as well as the carrier--envelope phase (CEP) of the laser pulse. We compare the final state population computed by the model to results obtained by numerical propagation of the time-dependent Schr\"odinger equation (TDSE) for the hydrogen atom. While we find qualitative agreement in the CEP dependence of the populations in principal quantum numbers, $n$, the populations to individual angular momentum channels, $\ell$, are found to be inconsistent between model and TDSE. Thus, our results show that improvements of the quasiclassical trajectories are in order for a quantitative model of frustrated tunneling ionizaiton.

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