Abstract

The field-induced double ionization of a model two-electron quantum system is investigated by direct numerical integration of the nonstationary Schroedinger equation. The contribution of different processes to a formation of doubly charged ions is analyzed.

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References

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  1. M. Gavrila, Atoms in intense laser field (Academic, New-York, 1992)
  2. N.B. Delone, and V.P. Krainov, Multiphoton processes in atoms (Springer, Berlin, 1994)
    [CrossRef]
  3. M.V. Fedorov, Atomic and free electrons in a strong light field (World Scientific, Singapore, 1997)
  4. S. Augst, D. Strickland, D.D. Meyerhofer, S.L. Chin, and J.H. Eberly, "Tunneling ionization of noble gases in a high-intensity laser field," Phys.Rev.Lett. 63, 2212-2215, (1989).
    [CrossRef] [PubMed]
  5. D.N. Fittingoff, P.R. Bolton, B. Chang, and K.C. Kulander, "Observation of non-sequential double ionization of helium with optical tunneling," Phys. Rev. Lett. 69, 2642-2645, (1992).
    [CrossRef]
  6. D.N. Fittingoff, P.R. Bolton, B. Chang, and K.C Kulander, "Polarization dependence of tunneling ionization of helium and neon by 120-fs pulses at 614 nm," Phys. Rev. A 49, 2174, (1994).
    [CrossRef]
  7. B. Walker, B. Sheehy, L.F. DiMauro et al, "Precision measurement of strong-field double ionization of helium," Phys. Rev. Lett. 73, 1227-1230, (1994).
    [CrossRef] [PubMed]
  8. P.B.Corkum, "Plasma perspective on strong field multiphoton ionization," Phys. Rev. Lett. 71, 1994-1996, (1993).
    [CrossRef] [PubMed]
  9. A. Becker, and F.H.M. Faisal, "Mechanism of laser-induced double ionization of helium," J. Phys. B 29, L197-L202, (1996).
    [CrossRef]
  10. M.Y Kuchiev, "Adiabatic mechanism of multiply charged ion production by a laser field through ATI states of an atom," Phys. Lett. A 212, 77, (1996).
    [CrossRef]
  11. E.A. Volkova, A.M. Popov, and O.V. Tikhonova, "Double-electron ionization of a quantum system in a laser field: rescattering and interparticle correlations," JETP 91, 706-712, (2000).
    [CrossRef]
  12. W.-C. Liu, J.H Eberly, S.L. Haan, and R. Grobe, "Correlation effects in two-electron model atoms in intense laser fields," Phys. Rev. Lett. 83, 520-523 (1999).
    [CrossRef]
  13. H.W. van der Hart and K. Burnett, "Recollision model for double ionization of atoms in strong laser fields," Phys. Rev.A 62, 013407(10), (2000).
    [CrossRef]

Other

M. Gavrila, Atoms in intense laser field (Academic, New-York, 1992)

N.B. Delone, and V.P. Krainov, Multiphoton processes in atoms (Springer, Berlin, 1994)
[CrossRef]

M.V. Fedorov, Atomic and free electrons in a strong light field (World Scientific, Singapore, 1997)

S. Augst, D. Strickland, D.D. Meyerhofer, S.L. Chin, and J.H. Eberly, "Tunneling ionization of noble gases in a high-intensity laser field," Phys.Rev.Lett. 63, 2212-2215, (1989).
[CrossRef] [PubMed]

D.N. Fittingoff, P.R. Bolton, B. Chang, and K.C. Kulander, "Observation of non-sequential double ionization of helium with optical tunneling," Phys. Rev. Lett. 69, 2642-2645, (1992).
[CrossRef]

D.N. Fittingoff, P.R. Bolton, B. Chang, and K.C Kulander, "Polarization dependence of tunneling ionization of helium and neon by 120-fs pulses at 614 nm," Phys. Rev. A 49, 2174, (1994).
[CrossRef]

B. Walker, B. Sheehy, L.F. DiMauro et al, "Precision measurement of strong-field double ionization of helium," Phys. Rev. Lett. 73, 1227-1230, (1994).
[CrossRef] [PubMed]

P.B.Corkum, "Plasma perspective on strong field multiphoton ionization," Phys. Rev. Lett. 71, 1994-1996, (1993).
[CrossRef] [PubMed]

A. Becker, and F.H.M. Faisal, "Mechanism of laser-induced double ionization of helium," J. Phys. B 29, L197-L202, (1996).
[CrossRef]

M.Y Kuchiev, "Adiabatic mechanism of multiply charged ion production by a laser field through ATI states of an atom," Phys. Lett. A 212, 77, (1996).
[CrossRef]

E.A. Volkova, A.M. Popov, and O.V. Tikhonova, "Double-electron ionization of a quantum system in a laser field: rescattering and interparticle correlations," JETP 91, 706-712, (2000).
[CrossRef]

W.-C. Liu, J.H Eberly, S.L. Haan, and R. Grobe, "Correlation effects in two-electron model atoms in intense laser fields," Phys. Rev. Lett. 83, 520-523 (1999).
[CrossRef]

H.W. van der Hart and K. Burnett, "Recollision model for double ionization of atoms in strong laser fields," Phys. Rev.A 62, 013407(10), (2000).
[CrossRef]

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Figures (5)

Fig. 1.
Fig. 1.

The probability of single (1) and double ionization (2) of the Xe-like atom versus laser intensity.

Fig. 2.
Fig. 2.

The probability of double ionization of H - versus laser intensity: solid curve – exact calculations, dashed curve – passive electron model.

Fig. 3.
Fig. 3.

The electron-density distributions obtained for the Xe-like atom in the passive electron model for laser intensity P=5·1014 W/cm2 at different instants of time: a) 2T, b) 4T, c) 7T, d) 9T. The levels of equal probability are:1-10-3, 2--10-4.

Fig. 4.
Fig. 4.

The time-dependent mean coordinates of electrons obtained by passive electron model in the high intensity region P=3·1015 W/cm2; curve 1 corresponds to the active electron and curve 2―to the passive one.

Fig. 5.
Fig. 5.

The electron-density distribution obtained for the Xe-like atom in exact calculations for laser intensity P=1015 W/cm2 at different instants of time: a) 3T, b) 3.2T, c) 3.4T, d) 3.6T, e) 3.8T, f) 4T. The levels of equal probability are: 1-10-3, 2-10-3

Equations (4)

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i ψ t = [ H 0 e ( x 1 + x 2 ) ε ( t ) cos ω t ] ψ
H 0 = p 1 2 2 m + p 2 2 2 m z e 2 α 2 + x 1 2 z e 2 α 2 + x 2 2 + e 2 α 2 + ( x 1 x 2 ) 2 .
W 1 = a a d x 1 d x 2 | ψ ( x 1 x 2 t ) | 2 + a a d x 2 d x 1 | ψ ( x 1 x 2 t ) | 2 W b
x 1 , 2 = x 1 , 2 | ψ ( x 1 , x 2 ) | 2 d x 2 , d x 1 .

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