Limits of Strong Field Rescattering in the Relativistic Regime

Klaiber, Michael; Hatsagortsyan, Karen Z.; Wu, Jian; Luo, Sui; Grugan, Patrick; Walker, Barry

doi:10.1103/physrevlett.118.093001

Cited by 25 publications

(14 citation statements)

References 60 publications

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“…These include radiation pressure [6], momentum distribution between fragments upon ionization [7][8][9], and chiral effects in HHG [10]. The effects have been investigated for very intense (relativistic and nearrelativistic) infra-red (IR) fields [11][12][13][14], as well as for shorter-wavelength fields which are becoming available in the strong-field regime [15].…”

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confidence: 99%

Dissecting Strong-Field Excitation Dynamics with Atomic-Momentum Spectroscopy

2020

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Strong, focussed linearly-polarized infra-red fields electronically excite and accelerate atoms in the laser propagation and the transverse directions. We develop a numerically-tractable, quantummechanical treatment of correlations between internal and centre-of-mass (c.m.) dynamics, and apply it to the hydrogen atom. The propagation-direction c.m. momentum carries no information on the internal dynamics. The transverse momentum records the time spent in the field, allowing femtosecond reconstruction of the strong-field excitation process. The ground state becomes weakfield seeking, an unambiguous signature of the Kramers-Henneberger regime.

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confidence: 99%

Dissecting Strong-Field Excitation Dynamics with Atomic-Momentum Spectroscopy

2020

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“…p is the momentum operator of the relative motion of the electron with respect to the proton, P is the momentum of the CM, µ = m e m p /(m e + m p ) is the reduced mass of the atom and M = m e + m p . The importance of non-dipole effects was recognized long ago [10][11][12][13], and by now the influence of these effects on various atomic processes in strong laser fields has been studied quite intensively (see, for example, [14][15][16][17][18][19][20][21][22] and references therein). However, non-separability of the CM motion has not received much attention so far [9], as we suppose, due to the computational complexity of the problem.…”

Section: Treating 6d Hydrogen Atom In Strong Laser Field With Quantum...mentioning

confidence: 99%

“…Here and below, we do not present the calculated y-components, since they are several orders of magnitude smaller than the x-and z-components due to the absence of terms depending on y in the coupling potential (6). Next, we have calculated the spectral densities |P x (ω)| 2 , |P z (ω)| 2 and |p x (ω)| 2 , |p z (ω)| 2 of the kinetic energies of the atom and electron (see definitions (16)(17)(18)(19)), which are shown in Fig. 2 for the region of excited states of the atom ω ≥ − 1 8 = −0.125 (see the lower graph in Fig.…”

Section: Electron and Cm-dynamics Of Hydrogen Atom In Strong Laser Fi...mentioning

confidence: 99%

Quantum-quasiclassical analysis of center-of-mass nonseparability in hydrogen atom stimulated by strong laser fields

Melezhik¹

2022

Preprint

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We have developed a quantum-quasiclassical computational scheme for quantitative treating of the nonseparable quantum-classical dynamics of the 6D hydrogen atom in a strong laser pulse. In this approach, the electron is treated quantum mechanically and the center-of-mass (CM) motion classically. Thus, the Schrödinger equation for the electron and the classical Hamilton equations for the CM variables, nonseparable due to relativistic effects stimulated by strong laser fields, are integrated simultaneously. In this approach, it is natural to investigate the idea of using the CMvelocity spectroscopy as a classical "build-up" set up for detecting the internal electron quantum dynamics. We have performed such an analysis using the hydrogen atom in linearly polarized laser fields as an example and found a strong correlation between the CM kinetic energy distribution after a laser pulse and the spectral density of electron kinetic energy. This shows that it is possible to detect the quantum dynamics of an electron by measuring the distribution of the CM kinetic energy.

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“…the ionization potential, and E a = κ 3 is the atomic field. Note that the introduced small parameter ≡ d/ρ, in fact, is directly related to the Lorentz deflection parameter [78,79]:…”

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confidence: 99%

Analytical approach to Coulomb focusing in strong-field ionization. II. Multiple recollisions

2018

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The role of the Coulomb potential of the atomic core for creation of caustics in the photoelectron momentum distribution for tunneling ionization in a linearly polarized strong laser field, usually termed as Coulomb focusing, is investigated within classical theory beyond the dipole approximation. Coulomb focusing is addressed by analytical calculation of Coulomb momentum transfer to the tunneled electron due to rescatterings, while applying perturbation theory and classifying the recollisions either as fast or as slow. The accuracy of the obtained analytical formulas for the Coulomb momentum transfer is investigated by analytical derivation of asymptotic photoelectron momentum distribution and its comparison to exact numerical calculations. With the help of the applied analytical treatment, we analyze the origin of the counterintuitive energy-dependent bend of the Coulomb focusing cusp in the photoelectron momentum distribution in a linearly polarized laser field in the non-dipole regime, and its scaling with the field parameters. The importance of high-order recollisions is also investigated and they are shown to be responsible for a decrease of the bend of the cusp at very low energies in this regime. In general, the momentum transfer caused by high-order rescattering events, while being a perturbation with respect to the instantaneous electron momentum at the rescattering, is shown to induce a significant non-perturbative contribution to the total momentum transfer.

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Limits of Strong Field Rescattering in the Relativistic Regime

Cited by 25 publications

References 60 publications

Dissecting Strong-Field Excitation Dynamics with Atomic-Momentum Spectroscopy

Dissecting Strong-Field Excitation Dynamics with Atomic-Momentum Spectroscopy

Quantum-quasiclassical analysis of center-of-mass nonseparability in hydrogen atom stimulated by strong laser fields

Analytical approach to Coulomb focusing in strong-field ionization. II. Multiple recollisions

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