Keldysh-Rutherford Model for the Attoclock

We demonstrate a clear similarity between attoclock offset angles and Rutherford scattering angles taking the Keldysh tunneling width as the impact parameter and the vector potential of the driving pulse as the asymptotic velocity. This simple model is tested against the solution of the time-depende...

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Bibliographic Details
Published in:Physical review letters 2018-09, Vol.121 (12), p.123201-123201, Article 123201
Main Authors: Bray, Alexander W, Eckart, Sebastian, Kheifets, Anatoli S
Format: Article
Language:English
Subjects:
Computer simulation
Mathematical models
Model testing
Monte Carlo simulation
Parameters
Rare gases
Schrodinger equation
Time dependence
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Summary:We demonstrate a clear similarity between attoclock offset angles and Rutherford scattering angles taking the Keldysh tunneling width as the impact parameter and the vector potential of the driving pulse as the asymptotic velocity. This simple model is tested against the solution of the time-dependent Schrödinger equation using hydrogenic and screened (Yukawa) potentials of equal binding energy. We observe a smooth transition from a hydrogenic to "hard-zero" intensity dependence of the offset angle with variation of the Yukawa screening parameter. Additionally, we make a comparison with the attoclock offset angles for various noble gases obtained with the classical-trajectory Monte Carlo method. In all cases we find a close correspondence between the model predictions and numerical calculations. This suggests a largely Coulombic origin of the attoclock offset angle and casts further doubt on its interpretation in terms of a finite tunneling time.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.123201