Classical study of atomic bound state dynamics in circularly polarized ultrastrong fields

Luo, Sui; Grugan, Patrick; Walker, Barry

doi:10.1088/0953-4075/47/13/135601

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…Ionization and propagation components of this model compare favorably with recent ultrastrong field experiments [17]. Monte Carlo trajectory ensembles in the model capture essential quantum aspects of the electron [23,24] and such semiclassical approaches have been compared to full quantum solutions with the Dirac equation [29]. Adding elastic rescattering is a natural extension of the model and the approach has advantages in its connection to the well-known three-step model [30].…”

Section: Relativistic Three-step Recollision Modelmentioning

confidence: 98%

“…New approaches are required to overcome the numerous challenges such as three-dimensional spatial dynamics that extend relativistically from an atomic unit of length to that of an optical wavelength in a femtosecond. Theory treatments have ranged from one-electron time-dependent Dirac and Klein-Gordon solutions [22] to fully classical [23][24][25][26]. Recent "bcwalker@udel.edu calculations have addressed the fundamental physics including the role of electron spin [27].…”

Section: Introductionmentioning

confidence: 99%

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Photoelectron energy spectra from elastic rescattering in ultrastrong laser fields: A relativistic extension of the three-step model

2015

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Using a relativistic adaptation of a three-step recollision model we calculate photoelectron energy spectra for ionization with elastic scattering in ultrastrong laser fields up to 24 a.u. (2 x 1019 W /cm 2). Hydrogenlike and noble gas species with Hartree-Fock scattering potentials show a reduction in elastic rescattering beyond 6 x 1016 W /cm 2 when the laser Lorentz deflection of the photoelectron exceeds its wave-function spread. A relativistic rescattering enhancement occurs at 2 x 1018 W /cm 2, commensurate with the relativistic motion of a classical electron in a single field cycle. The noble gas results are compared with available experiments. The theory approach is well suited to modeling scattering in the ultrastrong intensity regime that lies between traditional strong fields and extreme relativistic interactions.

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Section: Relativistic Three-step Recollision Modelmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Photoelectron energy spectra from elastic rescattering in ultrastrong laser fields: A relativistic extension of the three-step model

2015

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“…In this work, we use the semiclassical trajectory ensemble method [8,9]. Briefly, bound state ionization is calculated by tunneling [10] and the space-time relativistic photoelectron is modeled semiclassically with a 10 4 trajectory Monte-Carlo ensemble having a position and momentum spread matched to the tunneling wave function probability as it appears in the continuum.…”

Section: Rescattering Inner Shell Excitationmentioning

confidence: 99%

Ionization Dynamics for Atomic and Molecular Ions in Relativistic, Ultrastrong Laser Fields

Walker,

Jones,

Andreula

et al. 2023

J. Phys.: Conf. Ser.

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The discovery of laser-driven rescattering and high harmonic radiation out to a maximum photon energy of 3.17 times the ponderomotive energy (Up ) laid the groundwork for attosecond pulse generation and coherent X-rays. As the laser field drives the interaction to higher energies, relativity and the Lorentz force from the laser magnetic field enter into the dynamics. We present the results of recent studies of laser rescattering, including these effects, to give a quantitative description of rescattering dynamics in the high-energy limit, ie, recollision energies of order 1,000 hartree (27 keV). The processes investigated include inner K- and L-shell excitation and the ultimate limit of high harmonic generation via rescattering bremsstrahlung. The results indicate the path to the frontier area of x-ray strong field processes.

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The Role of Polarization for Bound States in Strong Fields

Walker,

Jones,

Andreula

et al. 2024

J. Phys.: Conf. Ser.

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As atomic matter interacts with ultrastrong fields, the bound electrons are polarized and have ionization energies changed by Stark-shifting. The unprecedented range of laser intensities from 1015 W cm−2 to 1024 W cm−2 can take the interaction from the neutral atom to a bare nucleus. We have used an outer, single active electron approximation to calculate the polarization and Stark-shifted binding energy for ultraintense lasers interacting with highly charged ions at intensities from 1014 W cm−2 to 1022 W cm−2. The polarization of the bound state can result in a dipole moment and Stark shift that may be 0.1 e a0 and 50 Eh, respectively. At these high intensities, relativistic effects must also be considered. Across the intensity range of these studies, the magnetic field of the laser does not comparably affect the bound state of the atom; the impact of polarization and Stark shift exceed changes to the bound state wave function and binding energy from including relativity.

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Classical study of atomic bound state dynamics in circularly polarized ultrastrong fields

Cited by 5 publications

References 38 publications

Photoelectron energy spectra from elastic rescattering in ultrastrong laser fields: A relativistic extension of the three-step model

Photoelectron energy spectra from elastic rescattering in ultrastrong laser fields: A relativistic extension of the three-step model

Ionization Dynamics for Atomic and Molecular Ions in Relativistic, Ultrastrong Laser Fields

The Role of Polarization for Bound States in Strong Fields

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