Interpretation of Momentum Distribution of Recoil Ions from Laser Induced Nonsequential Double Ionization

Becker, Andreas; Faisal, Farhard

doi:10.1103/physrevlett.84.3546

Cited by 193 publications

(124 citation statements)

References 16 publications

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“…An S-matrix approach to calculate electron sum-momentum distributions was also used in ref. [36], incorporating the correct Coulomb e-e interaction. In ref.…”

Section: Fig 1 Displays Nementioning

confidence: 99%

“…In ref. [36] a "cutoff" formula for f p || was derived to be p ||,cutof f = Re 4 U p + 2 2U p − I + p . The "cutoff" definition differs from the experimental one but at low light intensity its value is identical to the 4 U p found in the experiment and equal to the largest momentum which can be gained by acceleration in the light pulse.…”

Section: Fig 1 Displays Nementioning

confidence: 99%

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Laser-induced non-sequential double ionization investigated at and below the threshold for electron impact ionization

Eremina

Liu²,

Rottke³

et al. 2003

J. Phys. B: At. Mol. Opt. Phys.

102

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Abstract. We use correlated electron-ion momentum measurement to investigate laser induced non-sequential double ionization of Ar and Ne. Light intensities are chosen in a regime at and below the threshold where, within the rescattering model, electron impact ionization of the singly charged ion core is expected to become energetically forbidden. Yet, we find Ar ++ ion momentum distributions and an electron-electron momentum correlation indicative of direct impact ionization. Within the quasistatic model this may be understood by assuming that the electric field of the light wave reduces the ionization potential of the singly charged ion core at the instant of scattering. The width of the projection of the ion momentum distribution onto an axis perpendicular to the light beam polarization vector is found to scale with the square root of the peak electric field strength in the light pulse. A scaling like this is not expected from the phase space available after electron impact ionization. It may indicate that the electric field at the instant of scattering is usually different from zero and determines the transverse momentum distribution. A comparison of our experimental results with several theoretical results is given.

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“…An S-matrix approach to calculate electron sum-momentum distributions was also used in ref. [36], incorporating the correct Coulomb e-e interaction. In ref.…”

Section: Fig 1 Displays Nementioning

confidence: 99%

Section: Fig 1 Displays Nementioning

confidence: 99%

Laser-induced non-sequential double ionization investigated at and below the threshold for electron impact ionization

Eremina

Liu²,

Rottke³

et al. 2003

J. Phys. B: At. Mol. Opt. Phys.

102

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show abstract

“…Only recently, a new generation of differential measurements [3,4] along with various quantum [5][6][7][8][9][10] as well as classical calculations [11,12] provided convincing evidence that the so-called "rescattering" or recollision scenarioone of the three NS double ionization pathways (beyond collective tunneling, and shake-off) which have been proposed in the past -is the dominating mechanism. Here, one electron is ionized via tunneling, accelerated in the oscillating laser field and, under certain conditions, driven back to its parent ion knocking out another electron.…”

mentioning

confidence: 99%

Strongly directed electron emission in non-sequential double ionization of Ne by intense laser pulses

Moshammer

Ullrich

Feuerstein

et al. 2003

J. Phys. B: At. Mol. Opt. Phys.

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Double ionization of Ne by 25 fs, 1.0 PW/cm 2 laser pulses has been explored in a kinematically complete experiment using a "Reaction Microscope".Electrons are found to be emitted into a narrow cone along the laser polarization (ε), much more confined than for single ionization, with a broad maximum in their energy distribution along ε. Correlated momentum spectra show both electrons being ejected into the same hemisphere, in sharp contradiction to predictions based on field-free (e,2e) recollision dynamics, but, in overall agreement with recent semi-classical calculations for He.

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“…In fact, the double ionization process is rather complicated and subtle, both of the two NSDI processes and the sequential ionization have contributions to it and may dominate in the different regimes. In another aspect, Becker and Faisal proposed a "correlated energy sharing" model to describe the NSDI processes and nuclei recoil experiment [5,12,13]. The model is based on the so-called intense-field manybody S-matrix theory derived by a rearrangement of the usual S-matrix series and include time electron correlation and the rescattering mechanism.…”

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confidence: 99%

Correlated electron emission in laser-induced nonsequence double ionization of helium

Liu

Chen

2002

Phys. Rev. A

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In this paper, we have investigated the correlated electron emission of the nonsequence double ionization (NSDI) in an intense linearly polarized field. The theoretical model we employed is the semiclassical rescattering model, the model atom we used is the helium. We find a significant correlation between magnitude and direction of the momentum of two emission electrons, and give a good explanation for this striking phenomenon by observing the classical collisional trajectories. We argue that this correlation phenomenon is universal in NSDI process, as revealed by the recent experiment on the argon.PACS numbers: 32.80. Rm, 42.50.Hz, The excessive double ionization observed in Helium experiments [1-3] draws much attention to the multipleelectron dynamics in the laser-atom interaction. In these experiments the single ionization of He in a linearly polarized field is accurately predicted by the single active electron (SAE) approximation [2], well described by the Ammosov-Delone-Krainov (ADK) tunnelling theory [4]. However, the case of double ionization is more complicated. In the regime of very high intensities (I > 10 16 W/cm 2 ) where strong double ionization occurs, the double ionization keeps in good agreement with the sequential SAE models as that in the lower intensities regime(I < 10 14 W/cm 2 ). The double ionization deviates seriously from the sequential SAE model and shows a great enhancement in a "knee" regime [(0.8-3.0) × 10 15 W/cm 2 ]. This surprising large yields of the double ionization obviously indicates that the sequential ionization is no longer the dominating process in this regime and the electron-electron correlation has to be taken into account. Intense efforts to model the twoelectron process of the double ionization in a laser field have reproduced the main feature of the knee structure in the double ionization yield as a function of laser peak intensity and, moreover, yielded quantitative agreement with the experiments in some cases [5,6].The physical mechanism behind this nonsequential process is, however, still debatable. Both the "shake-off" * Email: fu libin@mail.iapcm.ac.cn model and the "recollision" model are suggested to describe the electron's correlation [1,3,7,8]. However, none of the two nonsequence double ionization (NSDI) mechanisms can completely explain the experimental observations. For the "shake-off" model, it can not give the reason for the decrease in the double ionization yields as the polarization of the laser field departs from linear [9-11]. In the "recollision" model, the returning electrons are known to have a maximum classical kinetic energy of ∼ 3.2U p (U p = e 2 F 2 /4m e ω 2 ), so one can determine a minimum intensity required for the rescattering electron to have enough energy to excite the inner electron. But the double ionization yields observed in experiments has no such an intensity threshold. In fact, the double ionization process is rather complicated and subtle, both of the two NSDI processes and the sequential ionization have contributions ...

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Interpretation of Momentum Distribution of Recoil Ions from Laser Induced Nonsequential Double Ionization

Cited by 193 publications

References 16 publications

Laser-induced non-sequential double ionization investigated at and below the threshold for electron impact ionization

Laser-induced non-sequential double ionization investigated at and below the threshold for electron impact ionization

Strongly directed electron emission in non-sequential double ionization of Ne by intense laser pulses

Correlated electron emission in laser-induced nonsequence double ionization of helium

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