Sequential Tunneling vs. Electron Correlation in Multiple Photo-ionization

Wang, X.; Tian, Justin; Pfeiffer, Adrian N.; Cirelli, Claudio; Keller, U.; Eberly, J. H.; Theory, Rochester

doi:10.48550/arxiv.1208.1516

2012

DOI: 10.48550/arxiv.1208.1516

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Sequential Tunneling vs. Electron Correlation in Multiple Photo-ionization

X. Wang¹,

Justin Tian²,

Adrian N. Pfeiffer³

et al.

Abstract: We take advantage of the information provided by use of elliptical polarization in a recent twoelectron release time experiment [A.N. Pfeiffer et al., Nature Physics 7, 428 (2011)]. This allows a comparative test of the currently dominant conjectures regarding independent-electron tunneling theory vs. fully electron-correlated classical release theory to describe electron release in strong-field double ionization.

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“…[5] for example). Recently, the ionization times of both electrons in SDI are also reproduced by the soft-core potential model when the ionization potentials are artificially adjusted to those of the target [6]. It indicates that the success of the classical methods do not depend on the details of potential, making it easy to be accepted that our calculations are stable upon the parameters of the Heisenberg-core potential.…”

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confidence: 69%

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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Classical Simulations Including Electron Correlations for Sequential Double Ionization

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“…Similar remarks also can be observed for the 33-fs pulse. This feature also explains the puzzle why the ionization time can be reproduced with the classical model either including or excluding the e-e correlation [11,12]. The origin of the broadening of the reduced momentum spectra is related to the time intervals when the first and the second ionizations occur.…”

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confidence: 89%

“…Zhou et al [11] have reproduced the experimental release time with a classical model by including the e-e correlation. Later, Wang et al [12] argued that the release time can be successfully explained with a similar classical model by properly adopting the soft-core parameter but excluding the e-e correlation, which implies that e-e correlation is not essential in SDI.…”

mentioning

confidence: 99%

“…Even though the classical model is robust, which has been demonstrated extensively in previous investigations [13][14][15][16], and also provides a straightforward interpretation with electron trajectory analysis [11,12], the physical picture of SDI is still unclear. Actually, to produce the experimental data, a scaling factor is adopted in [11,12] to shift the simulation curve. Strictly speaking, the experiment has not been reproduced.…”

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confidence: 99%

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Revealing the role of electron correlation in sequential double ionization

et al. 2014

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The experimental observations of sequential double ionization (SDI) of Ar [A. N. Pfeiffer et al., Nature Phys. 7, 428 (2011)], such as the four-peak momentum distribution and the ionization time of the first and second electrons, are investigated and reproduced with a quantum model by including and excluding the e-e correlation effect. Based on the comparison of experiment and simulation, the role of e-e correlation in SDI is discussed. It is shown that the inclusion of e-e correlation is necessary to reproduce the momentum distribution of electrons.

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Sequential Tunneling vs. Electron Correlation in Multiple Photo-ionization

Cited by 2 publications

References 20 publications

Classical Simulations Including Electron Correlations for Sequential Double Ionization

Classical Simulations Including Electron Correlations for Sequential Double Ionization

Revealing the role of electron correlation in sequential double ionization

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