2013
DOI: 10.1103/physrevlett.111.113003
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Observation of Electron Energy Discretization in Strong Field Double Ionization

Abstract: We report on the observation of discrete structures in the electron energy distribution for strong field double ionization of argon at 394 nm. The experimental conditions were chosen in order to ensure a nonsequential ejection of both electrons with an intermediate rescattering step. We have found discrete above-threshold ionization like peaks in the sum energy of both electrons, as predicted by all quantum mechanical calculations. More surprisingly, however, is the observation of two above-threshold ionizatio… Show more

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Cited by 35 publications
(29 citation statements)
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“…We hence exclude the mechanism of direct (e, 2e) ionization [39] for the hereobserved nonsequential double ionization. Alternatively, an intermediate doubly excited complex can be formed by multiple inelastic field-assisted recollisions [40][41][42][43][44][45], from which two coherently released electrons share a constant energy as observed in the nonsequential ATDI of argon atoms [20]. We expect a similar scenario of molecular nonsequential ATDI in our linearly polarized pulse, which is mostly sup pressed in a circularly polarized pulse by steering the electron trajectory away from the parent ion.…”
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confidence: 70%
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“…We hence exclude the mechanism of direct (e, 2e) ionization [39] for the hereobserved nonsequential double ionization. Alternatively, an intermediate doubly excited complex can be formed by multiple inelastic field-assisted recollisions [40][41][42][43][44][45], from which two coherently released electrons share a constant energy as observed in the nonsequential ATDI of argon atoms [20]. We expect a similar scenario of molecular nonsequential ATDI in our linearly polarized pulse, which is mostly sup pressed in a circularly polarized pulse by steering the electron trajectory away from the parent ion.…”
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confidence: 70%
“…In addition, one of the two detected electrons may originate from the ionization of a second molecule in the same laser pulse with an estimated probability of 30% in our experiment. We eliminate this kind of false coincidence by generating a spectrum using two electrons from different laser shots and subtracting it from the measured raw data [20]. This nicely suppresses the random background and enhances the intrinsic features of the ATDI spectra.…”
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confidence: 98%
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