Attosecond Streaking in the Low-Energy Region as a Probe of Rescattering

Xu, Ming-Hui; Peng, Liang-You; Zhang, Zheng; Gong, Qihuang; Tong, Xiao-Min; Pronin, Evgeny A.; Starace, Anthony F.

doi:10.1103/physrevlett.107.183001

Cited by 50 publications

(31 citation statements)

References 33 publications

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“…Our theoretical approach is based on our previous work on the direct solution of the full-dimensional, time-dependent Schrödinger equation (TDSE) for a single-electron atom in the presence of a strong laser pulse [15,16,24]. In the present work, we consider the He atom under the joint interaction of an XUV pulse and an intense IR laser pulse, with both pulses assumed to be linearly polarized.…”

Section: Theoretical Methodsmentioning

confidence: 99%

“…In the case of attosecond pulse trains, laser-induced coherent electron scattering was experimentally observed in the electron momentum spectra [14]. In our previous work [15,16], we considered the dynamics of atoms ionized by a single attosecond pulse combined with a moderately strong IR field. We found interference structures appearing at the low-energy part of the photoelectron energy spectra, which was analyzed by a semiclassical method.…”

Section: Introductionmentioning

confidence: 99%

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Interference structures in photoelectron spectra of atoms ionized by XUV pulses in the presence of a strong IR field

et al. 2013

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The dynamics of photoelectrons ionized by XUV pulses in the presence of a strong infrared (IR) field is theoretically investigated by solving the time-dependent Schrödinger equation (TDSE). We study the ionization dynamics of He by an XUV pulse in the presence of a relatively strong IR laser field, which is different from the conventional attosecond streaking experiments where a rather weak IR field is applied. Comparing with the photoelectron spectra produced by the IR field only, we find the spectra ionized by the combined fields construct interesting interference structures for different XUV photon energies and pulse intensities. These features can be analyzed and explained by a quantum-trajectory theory based on the strong-field approximation (SFA). The SFA theory shows excellent agreement with the TDSE results, revealing that these structures originate from interferences among photoelectrons ionized by XUV pluses (streaked by the strong IR field) at different moments, and in some energy regions, together with the photoelectrons ionized by the intense IR pulse itself.

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Section: Theoretical Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interference structures in photoelectron spectra of atoms ionized by XUV pulses in the presence of a strong IR field

et al. 2013

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“…Another assumption is that the wavepacket propagation in the continuum is dominated by the electromagnetic vector potential rather than by the interaction with the remaining ionic fragment in the exit channel. We also require that the kinetic energy of the emitted electron is high enough so that it is not driven back to the residual complex by the IR field (refer to Xu et al, 2011;Hou et al, 2012, for a discussion of attosecond streaking in the low-energy region). This particular variant of a "strong-field" approximation requires, in fact, a much weaker laser intensity than typically invoked in the "strong-field" approximation to ionization (see Joachain et al, 2012, and references therein).…”

Section: Attosecond Streaking Of Photoemission a Streaking Princmentioning

confidence: 99%

Attosecond chronoscopy of photoemission

2015

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Recent advances in the generation of well characterized sub-femtosecond laser pulses have opened up unpredicted opportunities for the real-time observation of ultrafast electronic dynamics in matter. Such attosecond chronoscopy allows a novel look at a wide range of fundamental photophysical and photochemical processes in the time domain, including Auger and autoionization processes, photoemission from atoms, molecules, and surfaces, complementing conventional energy-domain spectroscopy. Attosecond chronoscopy raises fundamental conceptual and theoretical questions as which novel information becomes accessible and which dynamical processes can be controlled and steered. These questions are currently a matter of lively debate which we address in this review. We will focus on one prototypical case, the chronoscopy of the photoelectric effect by attosecond streaking. Is photoionization instantaneous or is there a finite response time of the electronic wavefunction to the photoabsorption event? Answers to this question turn out to be far more complex and multi-faceted than initially thought. They touch upon fundamental issues of time and time delay as observables in quantum theory. We review recent progress of our understanding of time-resolved photoemission from atoms, molecules, and solids. We will highlight the unresolved and open questions and we point to future directions aiming at the observation and control of electronic motion in more complex nanoscale structures and in condensed matter.

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“…The details of our numerical solution of the TDSE can be found in Refs. [37][38][39]. In brief, we expand the wave function (r,t) in spherical harmonics, and the radial wave functions are discretized using the finite difference method.…”

Section: Comparisons Of Analytic Scaling Laws With Tdse and Qrs Rmentioning

confidence: 99%

Scaling laws for high-order-harmonic generation with midinfrared laser pulses

et al. 2015

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We derive an analytic expression for the wavelength scaling of the high-order-harmonic generation (HHG) yield induced by midinfrared driving laser fields. It is based on a quasiclassical description of the returning electron wave packet, which is shown to be largely independent of atomic properties. The accuracy of this analytic expression is confirmed by comparison with results of numerical solutions of the time-dependent Schrödinger equation for wavelengths in the range of 1.4 μm ≤ λ ≤ 4 μm. We verify the wavelength scaling of the HHG yield found numerically for midinfrared laser fields in a recent paper by Le et al. [Phys. Rev. Lett. 113, 033001 (2014)].

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Attosecond Streaking in the Low-Energy Region as a Probe of Rescattering

Cited by 50 publications

References 33 publications

Interference structures in photoelectron spectra of atoms ionized by XUV pulses in the presence of a strong IR field

Interference structures in photoelectron spectra of atoms ionized by XUV pulses in the presence of a strong IR field

Attosecond chronoscopy of photoemission

Scaling laws for high-order-harmonic generation with midinfrared laser pulses

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