Complex sub-laser-cycle electron dynamics in strong-field nonsequential triple ionizaion

Zhou, Yueming; Liao, Qing; Lu, Peixiang

doi:10.1364/oe.18.016025

Cited by 52 publications

(21 citation statements)

References 29 publications

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“…This classical model, introduced in [18], has been successful in understanding the physical process of NSDI before [18][19][20][21]23,24,[27][28][29]50]. In the classical model, the evolution of the two-electron system is determined by the classical equation of motion (atomic units are used throughout until stated otherwise):…”

Section: The Classical Ensemble Modelmentioning

confidence: 99%

“…This DI process is called a nonsequential double ionization (NSDI). In the past two decades, NSDI has been extensively investigated both experimentally [3][4][5][6][7][8][9][10][11][12] and theoretically [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Nowadays the widely accepted mechanism for NSDI is the rescattering picture [30], which is also responsible for high harmonic generation [31][32][33][34][35] and high order above threshold ionization [1].…”

Section: Introductionmentioning

confidence: 99%

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Electron correlations in nonsequential double ionization of helium at intensity below the recollision threshold

Zhang

et al. 2012

Journal of Modern Optics

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With a classical three-dimensional ensemble model, we investigate the correlation behavior of the electrons from nonsequential double ionization of helium at intensities below the recollision threshold. At these laser intensities well below the recollision threshold, the two-electron momentum spectra pairs along the laser polarization show anticorrelated behaviors. This anticorrelated behavior becomes stronger when the laser intensity decreases, and then becomes weaker as the laser intensity further decreases. The responsible microscopic dynamics for the anticorrelated behavior and its intensity dependence is explored by back analyzing the double ionization trajectories.

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Section: The Classical Ensemble Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electron correlations in nonsequential double ionization of helium at intensity below the recollision threshold

Zhang

et al. 2012

Journal of Modern Optics

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“…In nonsequential double ionization (NSDI), the second electron is ionized by the recollision of the first tunneled electron [1]. Because of this recollision, the two electrons from NSDI exhibit a highly correlated behavior [2][3][4][5][6]. In sequential double ionization (SDI), it is usually assumed that no correlation exists between the two electrons, and thus the ionization of the electrons can be treated as two independent tunneling-ionization steps.…”

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confidence: 99%

Classical Simulations Including Electron Correlations for Sequential Double Ionization

et al. 2012

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With a classical ensemble model that including electron correlations during the whole ionization process, we investigated strong-field sequential double ionization of Ar by elliptically polarized pulses at the quantitative level. The experimentally observed intensity-dependent three-band or four-band structures in the ion momentum distributions are well reproduced with this classical model. More importantly, the experimentally measured ionization time of the second electrons [A. N. Pfeiffer et al., Nature Phys. 7, 428 (2011)], which can not be predicted by the standard independent-electron model, is quantitatively reproduced by this fully classical correlated model. The success of our work encourages classical description and interpretation of the complex multi-electron effects in strong field ionization where nonperturbative quantum approaches are currently not feasible.PACS numbers: 32.80. Rm, 31.90.+s, 32.80.Fb Among various intense laser-induced phenomena, strong field double ionization (DI) is one of the most important and fundamental processes. During the past decades, a great number of experimental as well as theoretical studies have been performed on this area. It has been known that DI proceeds either sequentially or nonsequentially. In nonsequential double ionization (NSDI), the second electron is ionized by the recollision of the first tunneled electron [1]. Because of this recollision, the two electrons from NSDI exhibit a highly correlated behavior [2][3][4][5][6]. In sequential double ionization (SDI), it is usually assumed that no correlation exists between the two electrons, and thus the ionization of the electrons can be treated as two independent tunneling-ionization steps. However, this assumption has been called into doubt by recent experiments [7,8]. In Ref. [7], it has been shown that there is a clear angular correlation between the two electrons from SDI, which implies that the successive ionization steps are not independent in SDI. In Ref.[8], the authors found that the ionization time of the second electron from SDI is much earlier than the prediction of the independent-electron model. These observations declare that the electron correlations in SDI should be reexamined carefully.Theoretically, an accurate description of the electron correlations in DI needs full quantum theory. However, due to the enormous computational demand, the solution of the time-dependent schrödinger equation of the two-electron system in the strong field, especially in the case of elliptically polarized laser fields, is not feasible currently. Instead, a fully classical treatment of the twoand multi-electron systems proposed by Eberly et al. has been well established [9][10][11][12]. During the past decade, this model has been successful in exploring the strong-field ionization processes at the qualitative level. However, * Corresponding author: lupeixiang@mail.hust.edu.cn it fails when made a quantitative comparison with experiments. For example, in ref. [13] it has been shown that the saturation intensity ...

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“…In order to explore the responsible dynamics process for the asymmetry of correlated emissions for the parallel alignment and the distinction of anticorrelated emissions for different alignments, we take advantage of back analysis [35,38]. Tracing the classical DI trajectories allows us easily to determine the recollision time, the ionization time and the recollision energy.…”

Section: Resultsmentioning

confidence: 99%

Intensity dependence of nonsequential double ionization of aligned asymmetric molecules

2011

Journal of Modern Optics

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The electron correlation in nonsequential double ionization (NSDI) from aligned HeH þ molecules by intense laser pulses at various intensities has been investigated with the three-dimensional classical ensemble model. The results show that the correlated emission from NSDI for the parallel alignment is asymmetric. By back analysis the contribution of Coulomb focusing from H þ to this asymmetry has been also demonstrated besides the permanent dipole moment of the HeH 2þ molecule. Moreover, the asymmetry of correlated emissions enhances sharply with decreasing laser intensity. This is attributed to the intensity dependence of the effects of the permanent dipole moment of the HeH 2þ molecule and Coulomb focusing from H þ on the recollision dynamics. Besides the two electrons involved in NSDI of HeH þ , molecules aligned parallel to the laser polarization are more likely to exit the molecule into the opposite hemispheres compared with the perpendicular alignment at some laser intensities, which is different from the case of symmetric molecules.

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Complex sub-laser-cycle electron dynamics in strong-field nonsequential triple ionizaion

Cited by 52 publications

References 29 publications

Electron correlations in nonsequential double ionization of helium at intensity below the recollision threshold

Electron correlations in nonsequential double ionization of helium at intensity below the recollision threshold

Classical Simulations Including Electron Correlations for Sequential Double Ionization

Intensity dependence of nonsequential double ionization of aligned asymmetric molecules

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