Abstract

The dynamics of Neon double ionization by 25 fs, 1.0 PW/cm2 laser pulses at 795 nm has been studied in a many particle coincidence experiment. The momentum vectors of all ejected atomic fragments (electrons and ions) have been measured using combined electron and recoil-ion momentum spectroscopy. Electron emission spectra for double and single ionization will be discussed. In both processes the mean electron energies differ considerably and high energetic electrons with energies of more than 120 eV have been observed for double ionization. The experimental results are in qualitative agreement with the rescattering model.

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References

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  1. A. L'Huiller, L.A. Lompre, G. Mainfray and C. Manus, "Multiply charged ions induced by multiphoton absorption in rare gases at 0.53 µm," Phys. Rev. A 27, 2503 (1983).
    [CrossRef]
  2. N.B. Delone and V.P. Krainov, "Energy and angular electron spectra for the tunnel ionization of atoms by strong low-frequency radiation," J. Opt. Soc. Am. B 8, 1207 (1991).
  3. M. Protopapas, C.H. Keitel and P.L. Knight, "Atomic physics with super-high intensity lasers," Rep. Prog. Phys. 60, 389 (1997).
    [CrossRef]
  4. D.N. Fittinghoff, P.R. Bolton, B. Chang and K.C. Kulander, "Observation of nonsequential double ionization of helium with optical tunneling," Phys. Rev. Lett. 69, 2642 (1992).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  8. K.C. Kulander, J. Cooper and K.J. Schafer, "Laser-assisted inelastic rescattering during above-threshold ionization," Phys. Rev. A51, 561 (1995).
  9. J.B. Watson, A. Sanpera, D.G. Lappas, P.L. Knight and K. Burnett, "Nonsequential double ionization of Helium," Phys. Rev. Lett. 78, 1884 (1997).
    [CrossRef]
  10. B. Walker, B. Sheehy, L.F. DiMauro, A. Agostini, K.J. Schafer and K.C. Kulander, "Precision measurement of strong field double ionization of Helium," Phys. Rev. Lett 73, 1227 (1994).
    [CrossRef] [PubMed]
  11. R. Dörner, V. Mergel, O. Jagutzki, L. Spielberger, J. Ullrich, R. Moshammer, H. Schmidt-Böcking, "Cold target recoil ion momentum spectroscopy: a 'momentum microscope' to view atomic collision dynamics," Phys. Rep. 330, 95 (2000).
    [CrossRef]
  12. Th. Weber et al., "Recoil ion momentum distributions for single and double ionization of Helium in strong laser fields," Phys. Rev. Lett. 84, 443 (2000).
    [CrossRef] [PubMed]
  13. R. Moshammer et al., "Momentum distributions of Ne n+ ions created by an intense ultrashort laser pulse," Phys. Rev. Lett. 84, 447 (2000).
    [CrossRef] [PubMed]
  14. A. Becker and F.H.M. Faisal, "Interpretation of momentum distribution of recoil ions from laser induced nonsequential double ionization," Phys. Rev. Lett. 84, 3546 (2000).
    [CrossRef] [PubMed]
  15. R. Kopold, W. Becker, H. Rottke and W. Sandner, "Routes to nonsequential double ionization," Phys. Rev. Lett. 85, 3781 (2000).
    [CrossRef] [PubMed]
  16. M. Lein, E.K.U. Gross and V. Engel, "Intense field double ionization of Helium: Identifying the mechanism," Phys. Rev. Lett. 85, 4707 (2000).
    [CrossRef] [PubMed]
  17. S.L. Haan, N. Hoekema, S. Poniatowsky, W.C. Liu and J.H. Eberly, "Directional correlation in direct and sequential double ionization of model atoms," Opt. Express 7, 29 (2000). http://www.opticsexpress.org/oearchive/source/21863.htm
    [CrossRef] [PubMed]
  18. Th. Weber et al., "Correlated electron emission in multiphoton double ionization," Nature 405, 658 (2000).
    [CrossRef] [PubMed]
  19. B. Witzel, N.A. Papadogiannis and D. Charalambidis, "Charge-state resolved above threshold ionization," Phys. Rev. Lett. 85, 2268 (2000).
    [CrossRef] [PubMed]
  20. J. Ullrich et al., "Recoil ion momentum spectroscopy," J. Phys. B. 30, 2917 (1997), Topical Review.
    [CrossRef]
  21. B. Feuerstein, R. Moshammer and J. Ullrich, "Nonsequential multiple ionization in intense laser pulses: interpretation of ion momentum distributions within the classical 'rescattering' model," J. Phys. B. 33, L823 (2000).
    [CrossRef]
  22. B. Walker, B. Sheehy, K.C. Kulander and L.F. DiMauro, "Elastic rescattering in the strong field tunneling regime," Phys. Rev. Lett. 77, 5031 (1996).
    [CrossRef] [PubMed]

Other (22)

A. L'Huiller, L.A. Lompre, G. Mainfray and C. Manus, "Multiply charged ions induced by multiphoton absorption in rare gases at 0.53 µm," Phys. Rev. A 27, 2503 (1983).
[CrossRef]

N.B. Delone and V.P. Krainov, "Energy and angular electron spectra for the tunnel ionization of atoms by strong low-frequency radiation," J. Opt. Soc. Am. B 8, 1207 (1991).

M. Protopapas, C.H. Keitel and P.L. Knight, "Atomic physics with super-high intensity lasers," Rep. Prog. Phys. 60, 389 (1997).
[CrossRef]

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

U. Eichmann, M. Doerr, H. Maeda, W. Becker and W. Sandner, "Collective multielectron tunneling ionization in strong fields," Phys. Rev. Lett 84, 3550 (2000).
[CrossRef] [PubMed]

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

K.J. Schafer, B. Yang, L.F. DiMauro and K.C. Kulander, "Above threshold ionization beyond the high harmonic cutoff," Phys. Rev. Lett. 70, 1599 (1993).
[CrossRef] [PubMed]

K.C. Kulander, J. Cooper and K.J. Schafer, "Laser-assisted inelastic rescattering during above-threshold ionization," Phys. Rev. A51, 561 (1995).

J.B. Watson, A. Sanpera, D.G. Lappas, P.L. Knight and K. Burnett, "Nonsequential double ionization of Helium," Phys. Rev. Lett. 78, 1884 (1997).
[CrossRef]

B. Walker, B. Sheehy, L.F. DiMauro, A. Agostini, K.J. Schafer and K.C. Kulander, "Precision measurement of strong field double ionization of Helium," Phys. Rev. Lett 73, 1227 (1994).
[CrossRef] [PubMed]

R. Dörner, V. Mergel, O. Jagutzki, L. Spielberger, J. Ullrich, R. Moshammer, H. Schmidt-Böcking, "Cold target recoil ion momentum spectroscopy: a 'momentum microscope' to view atomic collision dynamics," Phys. Rep. 330, 95 (2000).
[CrossRef]

Th. Weber et al., "Recoil ion momentum distributions for single and double ionization of Helium in strong laser fields," Phys. Rev. Lett. 84, 443 (2000).
[CrossRef] [PubMed]

R. Moshammer et al., "Momentum distributions of Ne n+ ions created by an intense ultrashort laser pulse," Phys. Rev. Lett. 84, 447 (2000).
[CrossRef] [PubMed]

A. Becker and F.H.M. Faisal, "Interpretation of momentum distribution of recoil ions from laser induced nonsequential double ionization," Phys. Rev. Lett. 84, 3546 (2000).
[CrossRef] [PubMed]

R. Kopold, W. Becker, H. Rottke and W. Sandner, "Routes to nonsequential double ionization," Phys. Rev. Lett. 85, 3781 (2000).
[CrossRef] [PubMed]

M. Lein, E.K.U. Gross and V. Engel, "Intense field double ionization of Helium: Identifying the mechanism," Phys. Rev. Lett. 85, 4707 (2000).
[CrossRef] [PubMed]

S.L. Haan, N. Hoekema, S. Poniatowsky, W.C. Liu and J.H. Eberly, "Directional correlation in direct and sequential double ionization of model atoms," Opt. Express 7, 29 (2000). http://www.opticsexpress.org/oearchive/source/21863.htm
[CrossRef] [PubMed]

Th. Weber et al., "Correlated electron emission in multiphoton double ionization," Nature 405, 658 (2000).
[CrossRef] [PubMed]

B. Witzel, N.A. Papadogiannis and D. Charalambidis, "Charge-state resolved above threshold ionization," Phys. Rev. Lett. 85, 2268 (2000).
[CrossRef] [PubMed]

J. Ullrich et al., "Recoil ion momentum spectroscopy," J. Phys. B. 30, 2917 (1997), Topical Review.
[CrossRef]

B. Feuerstein, R. Moshammer and J. Ullrich, "Nonsequential multiple ionization in intense laser pulses: interpretation of ion momentum distributions within the classical 'rescattering' model," J. Phys. B. 33, L823 (2000).
[CrossRef]

B. Walker, B. Sheehy, K.C. Kulander and L.F. DiMauro, "Elastic rescattering in the strong field tunneling regime," Phys. Rev. Lett. 77, 5031 (1996).
[CrossRef] [PubMed]

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Figures (7)

Fig. 1.
Fig. 1.

Schematic drawing of the experimental setup.

Fig. 2.
Fig. 2.

Ion time-of-flight spectrum at a laser intensity of 1.0 PW/cm2. The different Ne1+ peaks reflect the Ne isotope abundance. The H-ions are residual gas contributions.

Fig. 3.
Fig. 3.

Momentum correlation between Ne1+ ions and electrons which were registered in coincidence. Plotted are the ion and electron momentum components along the polarization of the laser field at a peak intensity of 1.0 PW/cm2. (log. Scale).

Fig. 4.
Fig. 4.

Longitudinal sum momentum of electrons and Ne1+ ions.

Fig. 5.
Fig. 5.

Electron energy versus emission angle for Ne single ionization. ϑ=0 corresponds to emission along the light polarization axis. (log. Scale).

Fig. 6.
Fig. 6.

Same as Fig. 5 for double ionization. Notice the different energy scale.

Fig. 7.
Fig. 7.

Electron energy distributions for emission along (a) and perpendicular (b) to the polarization axis in double ionization.

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