Imaging population transfer in atoms with ultrafast electron pulses

Shao, Hua‐Chieh; Starace, Anthony F.

doi:10.1103/physreva.94.030702

Cited by 12 publications

(16 citation statements)

References 37 publications

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“…[47,54], for the purpose of completeness we reproduce the main features of those results here. Figure 3 …”

Section: A LI 2s → 2 P Population Transfermentioning

confidence: 51%

“…As many details of our simulations have been discussed in the context of ultrafast electron diffraction [47,54], we focus on those aspects that are unique to the (e,2e) process and only summarize briefly our numerical procedures. Since the lithium electronic state ψ 1 (t) is written in terms of its eigenstates [see Eq.…”

Section: Simulation Detailsmentioning

confidence: 99%

“…However, in the case of laser-driven population transfer in lithium atoms, the scattering system is influenced by the external laser electromagnetic field, and hence the lithium target electronic state cannot be described simply as a coherent superposition state. In our previous works [47,54], we have developed a time-dependent distorted-wave approximation to simulate the diffraction of ultrafast electrons from laser-driven scattering target systems. This approximation fully accounts for the interaction between the laser and the scattering target system (in the electric dipole approximation) such that the dressing of the wave function of the incident electron and the population transfer in the lithium atoms can be accurately described, while the target-projectile interaction is modeled as a perturbation.…”

Section: B Time-resolved Electron Momentum Spectroscopymentioning

confidence: 99%

“…Specifically, we consider a laser-driven population transfer in lithium atoms from the ground state (2s) to the first excited state (2p) [47]. This electronic motion comprises two distinct time scales.…”

Section: Introductionmentioning

confidence: 99%

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Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

Shao

Starace

2018

Phys. Rev. A

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Owing to its ability to provide unique information on electron dynamics, time-resolved electron momentum spectroscopy (EMS) is used to study theoretically a laser-driven electronic motion in atoms. Specifically, a chirped laser pulse is used to adiabatically transfer the populations of lithium atoms from the ground state to the first excited state. During this process, impact ionization near the Bethe ridge by time-delayed ultrashort, high-energy electron pulses is used to image the instantaneous momentum density of this electronic population transfer. Simulations with 100 fs and 1 fs pulse durations demonstrate the capability of EMS to image the time-varying momentum density, including its change of symmetry as the population transfer progresses. Moreover, the spectra corresponding to different pulse durations reveal different kinds of electronic motion. We discuss how to properly interpret these time-resolved EMS spectra, which represent a generalization of time-independent EMS.

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“…[47,54], for the purpose of completeness we reproduce the main features of those results here. Figure 3 …”

Section: A LI 2s → 2 P Population Transfermentioning

confidence: 51%

Section: Simulation Detailsmentioning

confidence: 99%

Section: B Time-resolved Electron Momentum Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

Shao

Starace

2018

Phys. Rev. A

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“…Sub-relativistic electron pulses of attosecond durations can be made by ponderomotive forces in standing laser waves [30,31] or by time-varying electric fields [32][33][34]; see figure 1 for an overview. Such sub-relativistic attosecond electron pulses, which have a de Broglie wavelength that is well suited for atomicscale imaging [14], will advance ultrafast diffraction and microscopy to the time range of atomic-scale electron dynamics [35][36][37][38] and may also push forward other applications, including quantum state reconstruction [33], into novel resolution regimes. Recently, attosecond electron diffraction and microscopy could indeed be demonstrated in an experiment [34].…”

Section: Introductionmentioning

confidence: 99%

Characterization of non-relativistic attosecond electron pulses by transition radiation from tilted surfaces

Tsarev

Baum

2018

New J. Phys.

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Characterization of non-relativistic attosecond electron pulses by transition radiation from tilted surfaces AbstractWe consider analytically and numerically the emission of coherent transition radiation by fewfemtosecond and attosecond electron pulses. With optimized geometries based on tilted surfaces we avoid the influences of the beam diameter and velocity mismatch for sub-relativistic pulses. We predict the emission of visible and ultraviolet optical radiation that characterizes few-femtosecond or attosecond electron pulses in time. The total amount of radiation depends on the source' repetition rate and number of electrons per macro/microbunch and is in many cases sufficient for pulse length characterization in the emerging experiments.

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Time-Resolved Photoelectron Imaging of Molecular Coherent Excitation and Charge Migration by Ultrashort Laser Pulses

Yuan

Bandrauk

2018

J. Phys. Chem. A

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Charge migration is a fundamental and important process in the photochemistry of molecules and has been explored by time-resolved photoelectron angular distributions. A scheme based on UV pump and polarized soft X-ray probe techniques shows that photoelectron diffraction effects enable us to reconstruct electronic coherences encoding the information of the charge migration with extreme time resolutions. We discuss how probe pulse helicity influences the probing photoelectron spectra in the presence of molecular nonspherical Coulomb potentials. This phenomenon is analyzed theoretically and simulated via ab initio calculations for the molecular hydrogen ion, offering a reliable approach for measurements of charge migration and for the exploration of molecular structure in attosecond science.

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Imaging population transfer in atoms with ultrafast electron pulses

Cited by 12 publications

References 37 publications

Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

Time-resolved electron(e,2e)momentum spectroscopy: Application to laser-driven electron population transfer in atoms

Characterization of non-relativistic attosecond electron pulses by transition radiation from tilted surfaces

Time-Resolved Photoelectron Imaging of Molecular Coherent Excitation and Charge Migration by Ultrashort Laser Pulses

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