Phase dependence in the ionization of atoms by intense one-cycle laser pulses within the Landau–Dykhne approximation

Rastunkov, V. S.; Крайнов, В. П.

doi:10.1088/0953-4075/40/12/005

Cited by 20 publications

(11 citation statements)

References 38 publications

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“…Electron-emission asymmetry along the field polarization direction (left-right asymmetry) has been studied extensively as a typical feature of strong field ionization in a few-cycle pulse [18][19][20]. For the atomic ionization by a single-cycle pulse in the tunneling regime, the left-right asymmetry has been considered using simplified models based on Landau-Dykhne approximation [21] or Keldyshlike theory [22]. The pulse-phase dependence of the leftright asymmetry has also been discussed for ionization of the hydrogen ground state based on both quantum and classical calculations [23].…”

Section: Electron-emission Asymmetry and Energy Spectramentioning

confidence: 99%

Field ionization of Rydberg atoms in a single-cycle pulse

Yang

Robicheaux

2015

Phys. Rev. A

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We study the ionization of Rydberg atoms in a single-cycle-pulse electric field based on both classical and quantum calculations. The ionization-probability curve exhibits a "ripple" structure as a function of the pulse duration and the field amplitude. These "ripple" structures are found to be dependent on the angular distribution of the initial state. A large electron-emission asymmetry is observed, and the ionized electron is almost completely emitted to one side of the atom except when the pulse length is roughly one Rydberg period. In both the long-pulse and the short-pulse regimes, larger electron energy can be expected from the ionization of lower-lying Rydberg states, matching the observation in a recent experiment [S. Li and R. R. Jones, Phys. Rev. Lett. 112, 143006 (2014)]. This trend is closely related to the electron emission asymmetry associated with the field-direction change in a single-cycle pulse. The possible implications of the different energy transfer in a single-cycle pulse from that in a multi-cycle pulse are also discussed briefly for the strong field ionization of the ground atomic state.

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Section: Electron-emission Asymmetry and Energy Spectramentioning

confidence: 99%

Field ionization of Rydberg atoms in a single-cycle pulse

Yang

Robicheaux

2015

Phys. Rev. A

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“…To our knowledge, the existence of such pulses does not contradict Maxwell's equations, nor any other known physical law. Rastunkov and Krainov [26] strongly favored pulses with zero displacement, in order to prevent the electron from leaving the laser interaction region too early. In practice, however, a displacement of a few atomic units (c.f.…”

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confidence: 99%

Displacement effect in strong-field atomic ionization by an XUV pulse

et al. 2014

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We study strong-field atomic ionization driven by an XUV pulse with a non\-zero displacement, the quantity defined as the integral of the pulse vector potential taken over the pulse duration. We demonstrate that the use of such pulses may lead to an extreme sensitivity of the ionization process to subtle changes of the parameters of a driving XUV pulse, in particular, the ramp-on/off profile and the carrier envelope phase. We illustrate this sensitivity for atomic hydrogen and lithium driven by few-femto\-second XUV pulses with intensity in the $\rm 10^{14}~W/cm^2$ range. We argue that the observed effect is general and should modify strong-field ionization of any atom, provided the ionization rate is sufficiently high.Comment: 5 pages, 7 figure

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“…While half-cycle and singlecycle pulses with non-zero displacement have been observed [2,3], and in some cases such pulses are predicted to even deliver nonzero momentum to a free electron [4], further attempts to identify the origin of the effect seemed a worthwhile effort. We emphasize that several theoretical papers (see, for example, [5,6]) strongly favor pulses with a vanishing displacement. However, the condition is not of practical importance for very short pulses, for which the displacement would be small relative to the focusing region [7].…”

Section: Introductionmentioning

confidence: 86%

Pulse-shape effects in ionization of atomic hydrogen by short-pulse XUV intense laser radiation: A sensitivity study

2015

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The displacement effect studied in a recent paper (Ivanov et al., Phys. Rev. A 90 (2014) 043401) in atomic ionization by a short XUV pulse is investigated in more detail. It is shown that achieving a significant displacement critically depends on the assumption of a plateau in the envelope function of the electric field, and that the ramp-on is fine-tuned in such a way that a drift velocity generated during the ramp-on phase can increase this displacement further. Seemingly minor variations in the electric fields defined in slightly different ways cause significant changes in the final results, in particular regarding the angular-momentum distribution of the ejected electron. In light of such a strong sensitivity seen in the predictions made with idealized pulse shapes and the likely difficulties of preparing such pulses experimentally, an experimental realization of the displacement effect will likely be a major challenge.

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Phase dependence in the ionization of atoms by intense one-cycle laser pulses within the Landau–Dykhne approximation

Cited by 20 publications

References 38 publications

Field ionization of Rydberg atoms in a single-cycle pulse

Field ionization of Rydberg atoms in a single-cycle pulse

Displacement effect in strong-field atomic ionization by an XUV pulse

Pulse-shape effects in ionization of atomic hydrogen by short-pulse XUV intense laser radiation: A sensitivity study

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