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Title: 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

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 Schroedinger 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.

Authors:
;  [1];  [2]
  1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012 (China)
  2. Department of Chemistry, University of Kansas, Lawrence, Kansas 66045 (United States)
Publication Date:
OSTI Identifier:
21448519
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 82; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.82.023402; (c) 2010 The American Physical Society; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ANGULAR DISTRIBUTION; ANNIHILATION OPERATORS; ATOMS; EIGENSTATES; ELECTRIC FIELDS; ELECTRONS; HELIUM; IONIZATION; LASER RADIATION; MONTE CARLO METHOD; MULTI-PHOTON PROCESSES; PHOTON-ATOM COLLISIONS; POTENTIALS; RESCATTERING; SCHROEDINGER EQUATION; SINGULARITY; TIME DEPENDENCE; TRAJECTORIES; WAVELENGTHS; ATOM COLLISIONS; CALCULATION METHODS; COLLISIONS; DIFFERENTIAL EQUATIONS; DISTRIBUTION; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ELEMENTS; EQUATIONS; FERMIONS; FLUIDS; GASES; LEPTONS; MATHEMATICAL OPERATORS; NONMETALS; PARTIAL DIFFERENTIAL EQUATIONS; PHOTON COLLISIONS; QUANTUM OPERATORS; RADIATIONS; RARE GASES; SCATTERING; WAVE EQUATIONS

Citation Formats

Jing, Guo, Xueshen, Liu, and Chu, Shih-I. 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. United States: N. p., 2010. Web. doi:10.1103/PHYSREVA.82.023402.
Jing, Guo, Xueshen, Liu, & Chu, Shih-I. 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. United States. https://doi.org/10.1103/PHYSREVA.82.023402
Jing, Guo, Xueshen, Liu, and Chu, Shih-I. Sun . "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". United States. https://doi.org/10.1103/PHYSREVA.82.023402.
@article{osti_21448519,
title = {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},
author = {Jing, Guo and Xueshen, Liu and Chu, Shih-I},
abstractNote = {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 Schroedinger 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.},
doi = {10.1103/PHYSREVA.82.023402},
url = {https://www.osti.gov/biblio/21448519}, journal = {Physical Review. A},
issn = {1050-2947},
number = 2,
volume = 82,
place = {United States},
year = {2010},
month = {8}
}