Classical study of ultrastrong nonperturbative-field interactions with a one-electron atom: Validity of the dipole approximation for the bound-state interaction

Grugan, Patrick; Luo, Sui; Videtto, M.; Mancuso, Christopher; Walker, Barry

doi:10.1103/physreva.85.053407

Cited by 14 publications

(15 citation statements)

References 75 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: 96%

“…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: 96%

Section: Introductionmentioning

confidence: 99%

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

2015

Self Cite

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“…[65][66][67][68][69][70] The stationary ground state of a target atom or ion is modeled by a microcanonical ensemble in the phase space of the active electron. The distribution function of the microcanonical ensemble is qðr; pÞ / dðe g À eðr; pÞÞ, in which e g is the relativistic quantum ground state energy of a hydrogen-like ion and eðr; pÞ is the relativistic energy of an electron in a Coulomb potential…”

Section: Relativistic Microcanonical Ensemblementioning

confidence: 99%

Favorable target positions for intense laser acceleration of electrons in hydrogen-like, highly-charged ions

Starace

2015

Physics of Plasmas

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Classical relativistic Monte Carlo simulations of petawatt laser acceleration of electrons bound initially in hydrogen-like, highly-charged ions show that both the angles and energies of the laseraccelerated electrons depend on the initial ion positions with respect to the laser focus. Electrons bound in ions located after the laser focus generally acquire higher (%GeV) energies and are ejected at smaller angles with respect to the laser beam. Our simulations assume a tightly-focused linearly-polarized laser pulse with intensity approaching 10 22 W/cm 2 . Up to fifth order corrections to the paraxial approximation of the laser field in the focal region are taken into account. In addition to the laser intensity, the Rayleigh length in the focal region is shown to play a significant role in maximizing the final energy of the accelerated electrons. Results are presented for both Ne

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“…For the first step of tunneling ionization, the energy scales are of order 10 to 30 a.u. While the external field does affect the ionizing bound state near the nucleus, it does not generally change the bound state wave function or ionization rate by more than a factor of 2 [19,20] . In this study, we use the low-frequency, nonrelativistic tunneling ionization rate [17] also referred to as the Ammosov, Delone, Krainov rate [21] .…”

mentioning

confidence: 97%

Elastic rescattering photoelectron distributions entering the relativistic regime

et al. 2015

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We report photoelectron energy spectra and angular distributions for ionization with elastic scattering in ultrastrong laser fields. Noble gas species with Hartree-Fock scattering potentials show a reduction in elastic rescattering with the increasing energy of ultrastrong fields and when the Lorentz deflection of the photoelectron exceeds its wave function spread. The relativistic extension of a three-step recollision model is well-suited to the ultrastrong intensity regime (>10 17 W∕cm 2) that lies between traditional strong fields and extreme relativistic interactions.

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Classical study of ultrastrong nonperturbative-field interactions with a one-electron atom: Validity of the dipole approximation for the bound-state interaction

Cited by 14 publications

References 75 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

Favorable target positions for intense laser acceleration of electrons in hydrogen-like, highly-charged ions

Elastic rescattering photoelectron distributions entering the relativistic regime

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