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

Geng, Jie; Peng, Liang-You; Song, Shu-Na; Gong, Qihuang

doi:10.1103/physreva.88.053418

Cited by 10 publications

(3 citation statements)

References 34 publications

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“…For the latter, the interfering electron trajectories within the same optical cycle give rise to a well-determined modulation pattern encoding information of the ionization process in the subfemtosecond time scale. A similar behavior has been observed by J-W. Geng et al in [21] for single ionization of He by considering two XUV attosecond pulses separated by the duration of the laser cycle period. In the experiments the intensity of the NIR field varies across the laser focus leading to "washing out" of the interference features, which are very sensitive to the field strength [22].…”

Section: Introductionsupporting

confidence: 84%

Retrieving intracycle interference in angular-resolved laser-assisted photoemission from argon

Hummert,

Kubin,

López

et al. 2018

Preprint

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We report on a combined experimental and theoretical study of XUV ionization of atomic argon in the presence of a near-infrared laser field. The resulting energy-and angle-resolved photoemission spectra have been described in the literature as interferences among different photoionization trajectories. Electron trajectories stemming from different optical laser cycles give rise to intercycle interference energy and result in new peaks known as sidebands. These sidebands are modulated by a coarse grained (gross) structure coming from the intracycle interference of the electron trajectories born during the same optical cycle. We calculate the photoelectron emission by solving the time-dependent Schrödinger equation ab initio and within the continuum-distorted wave strong field approximation. In order to compare with the experimental data we average the calculated energy-angle probability distributions over the experimental focal volume. This averaging procedure washes out the intracycle interference pattern, which we experimentally and theoretically (numerically) recover by subtracting two averaged distributions for slightly different nearinfrared laser field intensities.

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Section: Introductionsupporting

confidence: 84%

Retrieving intracycle interference in angular-resolved laser-assisted photoemission from argon

Hummert,

Kubin,

López

et al. 2018

Preprint

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show abstract

“…Moreover, the rescattering process of atom in XUV+IR two-color laser fields has been attracted extensive attentions in recent years. It was found the interference structures, resulting from the interference between multiple collisions and directly ionized electrons [45][46][47]. Also it is demonstrated that when the recolliding electrons of the IR field revisit the parent ion, they can absorb an XUV photon, yielding high-energy electrons [48].…”

Section: Introductionmentioning

confidence: 99%

Angle-resolved photoelectron energy spectrum from the high-order above-threshold ionization process in IR+XUV two-color laser fields

Jin¹,

Li²,

Yang³

et al. 2018

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

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High-order above-threshold ionization (HATI) spectrum in IR+XUV two-color laser fields has been investigated. We found that the quantum features corresponding to the absorption of the XUV photon is well illustrated by a peculiar dip structure in the second plateau of the HATI spectrum.By the channel analysis, we show that the angular distribution of the spectrum is attributed to the coherent summation over contributions of different channels, and the dip structure in the spectrum is directly related to the absorption of one XUV photon of the ionized electron during the laser-assisted collision (LAC) with its parent ion in the two-color laser fields. Moreover, by employing the saddle-point approximation, we obtain the classical energy orbit equation, and find that the dip structure comes from the fact that the LAC is limited at a certain direction by the momentum conservation law as the electron absorbs one XUV photon during the collision, where the probability of the HATI gets its minimum value. Finally, we find that the interference pattern in the whole spectrum is attributed to the interference of different orbits at collision moments t 0 and 2π/ω 1 − t 0 in the LAC process.

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“…When the IR intensity is strong, it can cause significant electron ionization. Hence, the rescattering electron can absorb an XUV photon when it revisits the core [23] or can interfere with photoelectron of one XUV-photon ionization streaked by the strong IR field [24,25], which needs other theoretical models to be investigated and is beyond the scope of the present work.…”

Section: Introductionmentioning

confidence: 99%

Temporal characterization of electron dynamics in attosecond XUV and infrared laser fields

Guo,

Jia,

Liu

et al. 2021

Preprint

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We use a Wigner distribution-like function based on the strong field approximation theory to obtain the time-energy distributions and the ionization time distributions of electrons ionized by an XUV pulse alone and in the presence of an infrared (IR) pulse. In the case of a single XUV pulse, although the overall shape of the ionization time distribution resembles the XUV-envelope, its detail shows dependence on the emission direction of the electron and the carrier-envelope phase of the pulse, which mainly results from the low-energy interference structure. It is further found that the electron from the counter-rotating term plays an important role in the interference. In the case of the two-color pulse, both the time-energy distributions and the ionization time distributions change with varying IR field. Our analysis demonstrates that the IR field not only modifies the final electron kinetic energy but also changes the electron's emission time, which results from the change of the electric field induced by the IR pulse. Moreover, the ionization time distributions of the photoelectrons emitted from atoms with higher ionization energy are also given, which show less impact of the IR field on the electron dynamics.

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

Cited by 10 publications

References 34 publications

Retrieving intracycle interference in angular-resolved laser-assisted photoemission from argon

Retrieving intracycle interference in angular-resolved laser-assisted photoemission from argon

Angle-resolved photoelectron energy spectrum from the high-order above-threshold ionization process in IR+XUV two-color laser fields

Temporal characterization of electron dynamics in attosecond XUV and infrared laser fields

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