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

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.023402· OSTI ID:21448519

Jing, Guo; Xueshen, Liu ^[1]; Chu, Shih-I ^[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)

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.

• OSTI ID: 21448519
• Journal Information: Physical Review. A, Vol. 82, Issue 2; Other Information: DOI: 10.1103/PhysRevA.82.023402; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

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