Probing tunneling dynamics of dissociative 
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 molecules using two-color bicircularly polarized fields

Guo, Zhenning; Fang, Yiqi; Ge, Peipei; Yu, Xiaoyang; Wang, Jiguo; Han, Meng; Gong, Qihuang; Liu, Yunquan

doi:10.1103/physreva.104.l051101

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…Tong et al [166] demonstrated that, after single ionization from the Kr side in the Ar-Kr dimer, the second electron may either tunnel out directly from the Ar side or get trapped by the binary potential before its release, inducing thereby a transient trapping time delay of about 3.5 fs. In addition, Guo et al [167] and Trabert et al [168] have attempted to connect the anisotropic tunneling of the hydrogen molecule to the Wigner time delay.…”

Section: Recent Advancesmentioning

confidence: 99%

Attosecond ionization time delays in strong-field physics

Ma 马,

Ni 倪,

Wu 吴

2024

Chinese Phys. B

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Electronic processes within atoms and molecules reside on the timescale of attoseconds. Recent advances in the laser-based pump-probe interrogation techniques have made possible the temporal resolution of ultrafast electronic processes on the attosecond timescale, including photoionization and tunneling ionization. These interrogation techniques include the attosecond streak camera, the reconstruction of attosecond beating by interference of two-photon transitions, and the attoclock. While the former two are usually employed to study photoionization processes, the latter is typically used to investigate tunneling ionization. In this Topical Review, we briefly overview these timing techniques towards an attosecond temporal resolution of ionization processes in atoms and molecules under intense laser fields. In particular, we review the backpropagation method, which is a novel hybrid quantum-classical approach towards full characterization of tunneling ionization dynamics. Continued advances in the interrogation techniques promise to pave the pathway towards the exploration of ever faster dynamical processes on an ever shorter timescale.

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Section: Recent Advancesmentioning

confidence: 99%

Attosecond ionization time delays in strong-field physics

Ma 马,

Ni 倪,

Wu 吴

2024

Chinese Phys. B

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“…Such controlling scenario should attracted much attention in ultrafast and strongfield physics, and this would have a promising perspective on controlling nondipole effects for more molecules with bi-circular fields. [48,49]…”

Section: Electric Nondipolementioning

confidence: 99%

Controlling Magnetic and Electric Nondipole Effects with Synthesized Two Perpendicularly Propagating Laser Fields

Dou

Fang

et al. 2023

Chinese Phys. Lett.

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Nondipole effects are ubiquitous and crucial in light-matter interaction. However, they are too weak to be directly observed. In strong-field physics, the motion of electrons is mainly confined in the transverse plane of light fields, which suppresses the significance of nondipole effects. Here, we present a theoretical study on enhancing and controlling the nondipole effect by using the synthesized two perpendicularly propagating laser fields. We calculate the three-dimensional photoelectron momentum distributions of strong-field tunneling ionization of Hydrogen atoms using the classical trajectory Monte Carlo model and show that the nondipole effects are noticeably enhanced in such laser fields due to their remarkable influences on the sub-cycle photoelectron dynamics. In particular, we reveal that the magnitudes of the magnetic and electric components of nondipole effects can be separately controlled by modulating the ellipticity and amplitude of driving laser fields. This novel scenario holds promising applications for future studies with ultrafast structured light fields.

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“…Recently, the attosecond holographic angular streaking scheme using two-color bicircular fields (ω + 2ω) has been widely used to explore time-resolved photoemission dynamics in atomic multiphoton ionization [16][17][18][19][20][21], such as probing the phase and amplitude of emitting wave packets [16], and measuring the time delay of spin-orbit coupled electronic states [20]. In contrast to atomic photoionization, molecular frame measurements of complex molecules show that the spatial distribution of molecular orbitals can result in the displacement of rescattering wavepacket [22], orientation-dependent electron phase distribution [23], and modulation of the releasing time of photoelectrons [24,25].…”

Section: Introductionmentioning

confidence: 99%

Probing Molecular Frame Wigner Time Delay and Electron Wavepacket Phase Structure of CO Molecule

Guo

Fang

et al. 2022

Ultrafast Sci

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The time delay of photoelectron emission serves as a fundamental building block to understand the ultrafast electron emission dynamics in strong-field physics. Here, we study the photoelectron angular streaking of CO molecules by using two-color (400+800 nm) corotating circularly polarized fields. By coincidently measuring photoelectrons with the dissociative ions, we present molecular frame photoelectron angular distributions with respect to the instantaneous driving electric field signatures. We develop a semiclassical nonadiabatic molecular quantum-trajectory Monte Carlo (MO-QTMC) model that fully captures the experimental observations and further ab initio simulations. We disentangle the orientation-resolved contribution of the anisotropic ionic potential and the molecular orbital structure on the measured photoelectron angular distributions. Furthermore, by analyzing the photoelectron interference patterns, we extract the sub-Coulomb-barrier phase distribution of the photoelectron wavepacket and reconstruct the orientation- and energy-resolved Wigner time delay in the molecular frame. Holographic angular streaking with bicircular fields can be used for probing polyatomic molecules in the future.

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Probing tunneling dynamics of dissociative H2 molecules using two-color bicircularly polarized fields

Cited by 11 publications

References 34 publications

Attosecond ionization time delays in strong-field physics

Attosecond ionization time delays in strong-field physics

Controlling Magnetic and Electric Nondipole Effects with Synthesized Two Perpendicularly Propagating Laser Fields

Probing Molecular Frame Wigner Time Delay and Electron Wavepacket Phase Structure of CO Molecule

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