Ionization Time and Exit Momentum in Strong-Field Tunnel Ionization

Teeny, Nicolas; Yakaboylu, Enderalp; Bauke, Heiko; Keitel, Christoph H.

doi:10.1103/physrevlett.116.063003

Cited by 106 publications

(73 citation statements)

References 36 publications

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“…An alternative approach is to monitor the instantaneous ionization rate during the pulse duration (18 , 23 , 68 , 70 ) or by applying a tiny signal field (27 ) and comparing the results to instantaneous tunnel ionization models. The probability density current through a virtual detector at the adiabatic tunnel exit point was found to be maximised a finite time t i > 0 after the peak of the field (18 ). However, this calculation does not take non-adiabatic effects into account (see section 5 and (25 )).…”

Section: Numerical Solutions Of the Time-dependent Schrödinger Equationmentioning

confidence: 99%

Attoclock revisited on electron tunnelling time

Hofmann

Landsman

Keller

2019

Journal of Modern Optics

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The last decade has seen an intense renewed debate on tunnelling time, both from a theoretical and an experimental perspective. Here, we review recent developments and new insights in the field of strong-field tunnel ionization related to tunnelling time, and apply these findings to the interpretation of the attoclock experiment [Landsman et al., Optica 1, 343 (2014)]. We conclude that models including finite tunnelling time are consistent with recent experimental measurements. Abbreviations:A adiabatic ADK Ammosov, Delone and Krainov model (1 , 2 ) CEO Carrier-Envelope-Offset phase ϕCEO CoM centre of mass CTMC Classical Trajectory Monte Carlo simulation FWHM full width half maximum IR infrared KR Keldysh-Rutherford model NA non-adiabatic PMD Photoelectron Momentum Distribution PPT Perelomov, Popov and Terent'ev model (3 , 4 ) SAE Single Active Electron approximation SCT Single Classical Trajectory SFA Strong Field Approximation TDSE Time-Dependent Schrödinger Equation

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Section: Numerical Solutions Of the Time-dependent Schrödinger Equationmentioning

confidence: 99%

Attoclock revisited on electron tunnelling time

Hofmann

Landsman

Keller

2019

Journal of Modern Optics

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“…For linearly polarized pulses, the main dynamics happens along the electric field of the laser pulse which underlies the success of some one-dimensional (1D) approximations [22][23][24][25][26][27][28][29][30][31][32][33]. These typically use various 1D model potentials to account for the behavior of the atomic system.…”

Section: Introductionmentioning

confidence: 99%

Improved one-dimensional model potentials for strong-field simulations

2018

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Based on a plausible requirement for the ground state density, we introduce a novel onedimensional (1D) atomic model potential for the 1D simulation of the quantum dynamics of a single active electron atom driven by a strong, linearly polarized few-cycle laser pulse. The form of this density-based 1D model potential also suggests improved parameters for other well-known 1D model potentials. We test these 1D model potentials in numerical simulations of typical strong-field physics scenarios and we find an impressively increased accuracy of the low-frequency features of the most important physical quantities. The structure and the phase of the high-order harmonic spectra also have a very good match to those resulting from the three-dimensional simulations, which enables to fit the corresponding power spectra with the help of a simple scaling function.

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“…If the strong driving laser pulse is linearly polarized then the most important features of the resulting quantum dynamics can usually be captured by a onedimensional (1D) approximation [30][31][32][33][34][35][36][37][38][39][40][41][42][43]. These typically use various 1D model potentials to account for the motion of the atomic system along the direction of the laser polarization.…”

Section: Introductionmentioning

confidence: 99%

Density-based one-dimensional model potentials for strong-field simulations in He, H2+ , and H2

et al. 2020

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We present results on the accurate one-dimensional (1D) modeling of simple atomic and molecular systems excited by strong laser fields. We use atomic model potentials that we derive from the corrections proposed earlier using the reduced ground state density of a three-dimensional (3D) single-active electron atom. The correction involves a change of the asymptotics of the 1D Coulomb model potentials while maintaining the correct ground state energy. We present three different applications of this method: we construct correct 1D models of the hydrogen molecular ion, the helium atom and the hydrogen molecule using improved parameters of existing soft-core Coulomb potential forms. We test these 1D models by comparing the corresponding numerical simulation results with their 3D counterparts in typical strong-field physics scenarios and we find an impressively increased accuracy in the dynamics of the most important atomic quantities on the time scale of the excitation. We also present the high-order harmonic spectra of the He atom, computed using our 1D atomic model potentials. They show a very good match with the structure and phase obtained from the 3D simulations in an experimentally important range of excitation amplitudes.

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Ionization Time and Exit Momentum in Strong-Field Tunnel Ionization

Cited by 106 publications

References 36 publications

Attoclock revisited on electron tunnelling time

Attoclock revisited on electron tunnelling time

Improved one-dimensional model potentials for strong-field simulations

Density-based one-dimensional model potentials for strong-field simulations in He, H2+ , and H2

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