Numerical Observation of the Rescattering Wave Packet in Laser-Atom Interactions

We investigate the ratio of double to single ionization of He in an intense laser field based on the rescattering model. Folding the rescattering energy spectra with the electron impact inelastic cross sections, we obtain the probability of double ionization due to the nonsequential ionization process. Our results are in reasonable agreement with the experiment [Walker et al., Phys. Rev. Lett. 73, 1227(1994]. Furthermore, we investigate the physical insights of the nonsequential double ionization by analyzing the rescattering energy spectra at different intensities and the contributions from individual returns. This study confirms the reliability of the rescattering energy spectra obtained from ab initio calculations. The rescattering information can be used to analyze many other dynamical processes in intense laser-matter interactions, such as molecular imaging.

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“…Within the SAE approximation, the corresponding time-dependent wave function is expressed as [20] (t) = −i…”

Section: Theoretical Methodsmentioning

confidence: 99%

“…Recently, rescattering information was obtained directly from a quantum simulation [20]. Morishita et al [21] extracted the rescattering information from the above-threshold ionization.…”

Section: Introductionmentioning

confidence: 99%

Double ionization of He in an intense laser field via a rescattering process

2010

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“…One of the most pronounced features of ATI in the long-wavelength limit is the high-energy photoelectron spectrum plateau extending up to 10 U P ( U P = I /4 ω 2 , denotes the ponderomotive energy, where I is the laser intensity and ω the frequency in atomic units)23. The underlying mechanism has been attributed to the tunneled electron’s multiple returns and rescattering by its parent ion4567891011.…”

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confidence: 99%

Momentum Distribution of Near-Zero-Energy Photoelectrons in the Strong-Field Tunneling Ionization in the Long Wavelength Limit

Xia

et al. 2015

Sci Rep

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We investigate the ionization dynamics of Argon atoms irradiated by an ultrashort intense laser of a wavelength up to 3100 nm, addressing the momentum distribution of the photoelectrons with near-zero-energy. We find a surprising accumulation in the momentum distribution corresponding to meV energy and a “V”-like structure at the slightly larger transverse momenta. Semiclassical simulations indicate the crucial role of the Coulomb attraction between the escaping electron and the remaining ion at an extremely large distance. Tracing back classical trajectories, we find the tunneling electrons born in a certain window of the field phase and transverse velocity are responsible for the striking accumulation. Our theoretical results are consistent with recent meV-resolved high-precision measurements.

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“…Figure 4(b) shows that the hump at low energies originates mainly from the forward-scattered PEs. To confirm this origin of the low-energy peak, we analyzed the time-dependent electron wave packet, which shows a return to, and subsequent exit from, a sphere around the parent ion [32].…”

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confidence: 99%