Signature of quantum interferences in above-threshold detachment of negative ions by a short infrared pulse

Bivona, S.; Bonanno, G.; Burlon, R.; Gurrera, Davide; Leone, Cláudio

doi:10.1103/physreva.77.051404

Cited by 16 publications

(22 citation statements)

References 22 publications

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“…Near threshold oscillations in angular distribution were explained as interferences of electron trajectories [14] and recently measured [15]. Diffraction fringes have been experimentally observed in photoionization of He atoms [11] and photodetachment in F − ions by femtosecond pulses for fixed frequency [16] and theoretically analyzed [17]. The interference pattern in multicycle photoelectron spectra can be identified as a diffraction pattern at a time grating composed of intracycle and intercycle interferences [17,18].…”

Section: Introductionmentioning

confidence: 84%

“…Diffraction fringes have been experimentally observed in photoionization of He atoms [11] and photodetachment in F − ions by femtosecond pulses for fixed frequency [16] and theoretically analyzed [17]. The interference pattern in multicycle photoelectron spectra can be identified as a diffraction pattern at a time grating composed of intracycle and intercycle interferences [17,18]. While the latter gives rise to the well-known above-threshold ionization (ATI) peaks, the former leads to a modulation of the ATI spectrum offering information on the subcycle ionization dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential

et al. 2010

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We analyze the photoelectron emission spectrum in atomic above-threshold ionization by a linearly polarized short-laser pulse. Direct electrons can be characterized by both intracycle and intercycle interferences. The former results from the coherent superposition of two different electron trajectories released in the same optical cycle, whereas the latter is the consequence of the superposition of multiple trajectories released in different cycles. In the present article, a semiclassical analytical expression for the complete (both intracycle and intercycle) interference pattern is derived. We show that the recently proposed semiclassical description in terms of a diffraction process at a time grating remains qualitatively unchanged in the presence of the long-range Coulomb potential. The latter causes only a phase shift of the intracycle interference pattern. We verify the predictions of the semiclassical model by comparison with full three-dimensional (3D) time-dependent Schrödinger equation (TDSE) solutions.One key finding is that the subcycle interference structures originating from trajectories launched within a time interval of less than 1 femtosecond should be experimentally observable also in low-resolution spectra for longer multicycle pulses.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential

et al. 2010

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“…3 for a three-cycle laser pulse. In this case, the structures of the atomic spectra are related to quantum interferences in time domain [41,42], which are affected by the ejection from different lattice sites for surface emission.…”

Section: Resultsmentioning

confidence: 99%

Photoelectron emission from LiF surfaces by ultrashort electromagnetic pulses

Acuna

Gravielle

2011

Phys. Rev. A

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Energy-and angle-resolved electron emission spectra produced by incidence of ultrashort electromagnetic pulses on a LiF(001) surface are studied by employing a distorted-wave method named the crystal surface-Volkov (CSV) approximation. The theory makes use of the Volkov phase to describe the action of the external electric field on the emitted electron, while the electron-surface interaction is represented within the tight-binding model. The CSV approach is applied to investigate the effects introduced by the crystal lattice when the electric field is oriented parallel to the surface plane. These effects are essentially governed by the vector potential of the external field, while the influence of the crystal orientation was found to be negligible.

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“…Near threshold oscillations in angular distribution were explained as interferences of electron trajectories [11] and measured by [12]. Diffraction fringes have been experimentally observed in photoionization of He [9,13] and Ne atoms [13] and photodetachment in H − and [14] F − ions by femtosecond pulses for fixed frequency [15] and theoretically analyzed [16][17][18][19]. Diffraction patterns were also found in spectra of laser-assisted XUV ionization, whose gross structure of sidebands were explained as the interference between electrons emitted within one period [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 94%

“…Diffraction patterns were also found in spectra of laser-assisted XUV ionization, whose gross structure of sidebands were explained as the interference between electrons emitted within one period [20][21][22][23][24]. The interference pattern in multi-cycle photoelectron spectra can be identified as a diffraction pattern at a time grating composed of intra-and intercycle interferences [16][17][18][19]. While the latter gives rise to the well-known ATI peaks [25][26][27], the former leads to a modulation of the ATI spectrum in the near infrered regime offering information on the subcycle ionization dynamics.…”

Section: Introductionmentioning

confidence: 99%

Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers

Dran

Arbó

2018

Phys. Rev. A

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We analyze the doubly differential electron momentum distribution in above-threshold ionization of atomic hydrogen by a linearly-polarized mid-infrared laser pulse. We reproduce side rings in the momentum distribution with forward-backward symmetry previously observed by Lemell et al. in Phys. Rev. A 87, 013421(2013), whose origin, as far as we know, has not been explained so far.By developing a Fourier theory of moiré patterns, we demonstrate that such structures stems from the interplay between intra-and intercycle interference patterns which work as two separate grids in the two-dimensional momentum domain. We use a three dimensional (3D) description based on the saddle-point approximation (SPA) to unravel the nature of these structures. When the periods of the two grids (intra-and intercycle) are similar, principal moiré patterns arise as concentric rings symmetrically in the forward and backward directions at high electron kinetic energy. Higher order moiré patterns are observed and characterized when the period of one grid is multiple of the other. We find a scale law for the position (in momentum space) of the center of the moiré rings in the tunneling regime. We verify the SPA predictions by comparison with time-dependent distorted wave strong-field approximation (SFA) calculations and the solutions of the full 3D time-dependent Schrödinger equation (TDSE).

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Signature of quantum interferences in above-threshold detachment of negative ions by a short infrared pulse

Cited by 16 publications

References 22 publications

Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential

Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential

Photoelectron emission from LiF surfaces by ultrashort electromagnetic pulses

Moiré patterns in doubly differential electron-momentum distributions in atomic ionization by mid-infrared lasers

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