Frustrated tunneling dynamics in ultrashort laser pulses
(2021) In Journal of Physics B: Atomic, Molecular and Optical Physics 54(15).- 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 Schrödinger equation (TDSE) for the hydrogen atom. While we find qualitative agreement in the CEP dependence of the populations in principal quantum numbers,... (More)
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 Schrödinger 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, ℓ, 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 ionization.
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- author
- Olofsson, Edvin LU ; Carlström, Stefanos LU and Dahlström, Jan Marcus LU
- organization
- publishing date
- 2021-08
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- frustrated tunneling, frustrated tunneling ionization, Keldysh theory, Rydberg atoms, strong-field approximation, strong-field ionization
- in
- Journal of Physics B: Atomic, Molecular and Optical Physics
- volume
- 54
- issue
- 15
- article number
- 154002
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85114812921
- ISSN
- 0953-4075
- DOI
- 10.1088/1361-6455/ac1ae4
- language
- English
- LU publication?
- yes
- id
- 03b0c22e-c449-4c4e-912d-9cf31798d9f8
- date added to LUP
- 2021-10-11 11:38:17
- date last changed
- 2024-05-04 13:55:59
@article{03b0c22e-c449-4c4e-912d-9cf31798d9f8,
abstract = {{<p>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 Schrödinger 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, ℓ, 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 ionization.</p>}},
author = {{Olofsson, Edvin and Carlström, Stefanos and Dahlström, Jan Marcus}},
issn = {{0953-4075}},
keywords = {{frustrated tunneling; frustrated tunneling ionization; Keldysh theory; Rydberg atoms; strong-field approximation; strong-field ionization}},
language = {{eng}},
number = {{15}},
publisher = {{IOP Publishing}},
series = {{Journal of Physics B: Atomic, Molecular and Optical Physics}},
title = {{Frustrated tunneling dynamics in ultrashort laser pulses}},
url = {{http://dx.doi.org/10.1088/1361-6455/ac1ae4}},
doi = {{10.1088/1361-6455/ac1ae4}},
volume = {{54}},
year = {{2021}},
}