Multiphoton Double Ionization of Ar and Ne Close to Threshold

Liu, Yunquan; Ye, Difa; Liu, Jie; Rudenko, Artem; Tschuch, S.; Dürr, M.; Siegel, M.; Morgner, Uwe; Gong, Qihuang; Moshammer, R.; Ullrich, J.

doi:10.1103/physrevlett.104.173002

Cited by 68 publications

(59 citation statements)

References 27 publications

(30 reference statements)

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“…Two recent experiments have shown that at the low laser intensity, the two-electron momentum along the laser polarization exhibits a surprising anticorrelated behavior [47,48], which is completely different from that at the high laser intensity. With the semiclassical model including tunneling of the first electron and the second excited electron produced by recollision, this experimental result is well reproduced [48]. With a strong field approximation calculation, it has been demonstrated that the recollision induced excitation with subsequent tunneling ionization can result in the correlated electron momentum distribution spreading in all of the quadrants [49].…”

Section: Introductionmentioning

confidence: 92%

“…The mechanism for the electron achieving final energy above 2U p in NSDI has been well demonstrated [44][45][46]. Two recent experiments have shown that at the low laser intensity, the two-electron momentum along the laser polarization exhibits a surprising anticorrelated behavior [47,48], which is completely different from that at the high laser intensity. With the semiclassical model including tunneling of the first electron and the second excited electron produced by recollision, this experimental result is well reproduced [48].…”

Section: Introductionmentioning

confidence: 98%

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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: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 98%

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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“…The joint momentum distributions were also shown to be sensitive to the carrier envelope phase (CEP) of a few-cycle laser pulse [6,7]. More recent experiments on double ionization of atoms using femtosecond laser pulses continue to reveal interesting phenomena, such as the anticorrelation of the two-electron momenta [8,9].…”

Section: Introductionmentioning

confidence: 99%

Two-photon double ionization of helium: Evolution of the joint angular distribution with photon energy and two-electron energy sharing

Zhang

Peng

et al. 2011

Phys. Rev. A

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Ab initio calculations of two-photon double ionization of helium with photon energies varying from the nonsequential regime to well above the double-ionization threshold are presented. A systematic study of the joint angular distributions of the two ionized electrons at different energy sharing shows that the role of electron correlations is imprinted in the joint angular distribution. In particular, a rather general pattern is identified in the nonsequential regime that is independent of photon energy, pulse length, and energy sharing between the two electrons. Interestingly, the same distribution pattern is found for the equal-energy-sharing case, even when the photon energy is well above the double-ionization threshold. In the case of an extremely uneven energy sharing, the distribution pattern changes drastically as the photon energy is increased. In particular, when the photon energy is greater than the second-ionization threshold, the dominant emission mode of the two electrons switches gradually from "back to back" to "side by side." Finally, the joint angular distribution is found to provide clear evidence of the role of electron correlations in the initial state.

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“…Recording the momentum spectra of doubly 10,11 and multiply 7 charged ions provided clear evidence that the emission of the second electron is triggered by the laser-driven recollision of the first electron with its parent ion. Even more insight into the process was gained in kinematically complete studies where the correlated two-electron momentum distributions were measured 11 and investigated for different laser parameters [12][13][14][15] . Measurements of the dynamics of NSDI in near-single cycle laser pulses have been restricted to recoil-ion spectra, which did not allow for the direct retrieval of the correlated electron-emission dynamics 16,17 .…”

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confidence: 99%

Attosecond tracing of correlated electron-emission in non-sequential double ionization

et al. 2012

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Despite their broad implications for phenomena such as molecular bonding or chemical reac tions, our knowledge of multi electron dynamics is limited and their theoretical modelling remains a most difficult task. From the experimental side, it is highly desirable to study the dynamical evolution and interaction of the electrons over the relevant timescales, which extend into the attosecond regime. Here we use near single cycle laser pulses with well defined electric field evolution to confine the double ionization of argon atoms to a single laser cycle. The measured two electron momentum spectra, which substantially differ from spectra recorded in all previous experiments using longer pulses, allow us to trace the correlated emission of the two electrons on sub femtosecond timescales. The experimental results, which are discussed in terms of a semiclassical model, provide strong constraints for the development of theories and lead us to revise common assumptions about the mechanism that governs double ionization.

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Multiphoton Double Ionization of Ar and Ne Close to Threshold

Cited by 68 publications

References 27 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

Two-photon double ionization of helium: Evolution of the joint angular distribution with photon energy and two-electron energy sharing

Attosecond tracing of correlated electron-emission in non-sequential double ionization

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