Intensity-dependent enhancements in high-order above-threshold ionization

Milošević, D. B.; Hasović, E.; Busuladžić, M.; Gazibegović-Busuladžić, A.; Becker, W.

doi:10.1103/physreva.76.053410

Cited by 79 publications

(99 citation statements)

References 77 publications

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“…These experiments have stimulated a number of theoretical efforts aimed at identifying the origin of this effect. Especially intriguing was the discovery that similar enhancements are observed in the ATD process, in which atomic negative ions, instead of neutral atoms, are detached by a laser field [2][3][4][5][6][7][8][9][10][11][12][13]. Based on model calculations employing zero-and finite-range potentials, it was realized that the aforementioned enhancements stem from the behaviors of detachment yields at multiphoton thresholds, which are consistent with predictions of the Wigner threshold law [22].…”

Section: Introductionsupporting

confidence: 61%

“…While threshold effects in ATD are very well understood and confirmed by numerous calculations [2][3][4][5][6][7][8][9][10][11][12][13], similar recent studies devoted to abovethreshold ionization (ATI) or to high-harmonic generation (HHG) (a competing process) reach different conclusions (see, e.g., Refs. [14][15][16]).…”

Section: Introductionmentioning

confidence: 99%

“…Although the threshold behavior of ATD spectra is very well understood owing to a large number of investigations of ATD plateau enhancements [2][3][4][5][6][7][8][9][10][11][12][13], a consistent interpretation of the threshold behavior of ATI and HHG processes for neutral atoms is far less firmly established. In the latter case, one must account for the role of the attractive Coulomb potential, including especially the Rydberg series converging to each multiphoton ionization threshold.…”

Section: Introductionmentioning

confidence: 99%

“…Theoretical analyses of the role of threshold laws in abovethreshold detachment (ATD) by strong laser fields have been carried out in many works [2][3][4][5][6][7][8][9][10][11][12][13]. While threshold effects in ATD are very well understood and confirmed by numerous calculations [2][3][4][5][6][7][8][9][10][11][12][13], similar recent studies devoted to abovethreshold ionization (ATI) or to high-harmonic generation (HHG) (a competing process) reach different conclusions (see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

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Threshold effects in strong-field ionization: Energy shifts and Rydberg structures

2012

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The behavior of strong-field ionization rates of neutral atoms in the vicinity of multiphoton ionization thresholds is analyzed using formal collision theory. Our approach, which accounts nonperturbatively for effects of an intense laser field, shows that the ionization rates have a nearly constant behavior below and above each multiphoton threshold and that between such thresholds there are an apparently finite number of rapid oscillations due to resonances with laser-field-modified Rydberg states. This pattern is typical for any atomic target, as we illustrate specifically for hydrogen and neon atoms. The flat behavior of the ionization yield near multiphoton thresholds gives the appearance of an energy shift of the ionization thresholds, which have been postulated in a number of recent studies concerning diverse aspects of above-threshold ionization and high-harmonic generation of atoms. The flat behaviors of the rates near threshold exhibit only a rather weak dependence on the laser-field intensity. Other aspects of the near-threshold behavior of ionization rates and their dependence on the laser-field parameters are also discussed.

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Section: Introductionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Threshold effects in strong-field ionization: Energy shifts and Rydberg structures

2012

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“…with integer n, the coherent superposition of many long orbits is constructive for certain groups of HATI peaks in the plateau; for a formal analytical proof, see [81,122]. The condition (18) means that the ponderomotively upshifted continuum threshold is multiphoton resonant with the ground state.…”

Section: Intensity-dependent Enhancements In the Ati Plateaumentioning

confidence: 99%

The plateau in above-threshold ionization: the keystone of rescattering physics

Becker

Goreslavski

Milošević

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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A review is presented of the rescattering plateau in laser-induced above-threshold ionization and its various features as they were discovered over time. Several theoretical explanations are discussed, from simple momentum conservation to the quantum-mechanical improved strongfield approximation and the inherent quantum orbits or, alternatively, entirely classical methods. Applications of the plateau to the extraction of atomic or molecular potentials and to the characterization of the driving laser pulse are also surveyed.

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