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Exploration of strong-field multiphoton double ionization, rescattering, and electron angular distribution of He atoms in intense long-wavelength laser fields: The coupled coherent-state approach
Guo, Jing Liu, Xue-Shen Chu, Shih-I
Guo, Jing
Liu, Xue-Shen
Chu, Shih-I
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Abstract
We extend the coupled coherent-state (CCS) approach to simulate the strong-field ionization of helium atoms at
long wavelengths. This approach uses a basis of trajectories guided by frozen Gaussian coherent states, sampled
from a Monte Carlo distribution, as the initial states of the quantum time-dependent Schr¨odinger equations.
The CCS trajectories move over averaged potentials, which can remove the Columbic singularities exactly. The
low-energy structure is predicted by our CCS calculation and a “rescattering” event is clearly identified in the
higher-energy regime. In addition, the nonsequential double ionization is also explored and the rescattering event
can be identified as the major mechanism. Finally, we also study the electron angular distribution of helium. It is
found that the maximum angle between the electron and electric field directions becomes smaller with increase
in the laser intensity and wavelength.
Description
This work was partially supported by the Chemical Sciences,
Geosciences and Biosciences Division of the Office of
Basic Energy Sciences, Office of Sciences, US Department
of Energy and by the US National Science Foundation.
J.G. would also like to acknowledge the partial support
of the Chinese Scholarship Council (CSC). J.G. and X.L.
were partially supported by the National Natural Science
Foundation of China under Grant No. 10974068.
Date
2010-08-03
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American Physical Society
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Guo, Jing, Xue-Shen Liu, and Shih-I Chu. "Exploration of strong-field multiphoton double ionization, rescattering, and electron angular distribution of He atoms in intense long-wavelength laser fields: The coupled coherent-state approach." Phys. Rev. A 82, 023402 – Published 3 August 2010 http://dx.doi.org/10.1103/PhysRevA.82.023402