Review on non-dipole effects in ionization and harmonic generation of atoms and molecules*

Wang, Mu-Xue; Chen, Si-Ge; Liang, Hao; Peng, Liang-You

doi:10.1088/1674-1056/ab5c10

Cited by 28 publications

(16 citation statements)

References 242 publications

(386 reference statements)

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“…However, the electric-quadrupole term is dominant in the s wave of the relative electron motion which forms the cusp, whereas the magnetic-dipole term contributes mostly to the p wave (see Ref. [32] for further details). PSECS calculated total integrated cross sections are listed in Table I.…”

Section: Experimental and Numerical Techniquesmentioning

confidence: 99%

Revealing the two-electron cusp in the ground states of He and H2 via quasifree double photoionization

Grundmann

Serov

Trinter

et al. 2020

Phys. Rev. Research

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We report on kinematically complete measurements and ab initio nonperturbative calculations of double ionization of He and H 2 by a single 800 eV circularly polarized photon. We confirm the quasifree mechanism of photoionization for H 2 and show how it originates from the two-electron cusp in the ground state of a two-electron target. Our approach establishes a method for mapping electrons relative to each other and provides valuable insight into photoionization beyond the electric-dipole approximation.

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Section: Experimental and Numerical Techniquesmentioning

confidence: 99%

Revealing the two-electron cusp in the ground states of He and H2 via quasifree double photoionization

Grundmann

Serov

Trinter

et al. 2020

Phys. Rev. Research

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“…Note in passing that nondipole effects have also been observed with near-infrared fields [51][52][53][54]; see Refs. [55][56][57] for recent reviews on nondipole effects in intense laser pulses. At near-infrared wavelengths the adiabaticity condition in Eq.…”

Section: Introductionmentioning

confidence: 99%

Nondipole effects in tunneling ionization by intense laser pulses

Madsen¹

2022

Preprint

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The limit of decreasing laser frequency can not be considered independently from nondipole effects due to increase in the laser-induced continuum electron speed in this limit. Therefore, in this work, tunneling ionization in the adiabatic limit is considered for an effective field that includes effects beyond the electric-dipole term to first order in 1/c, with c the speed of light. The nondipole term describes the interaction resulting from the electric dipole-induced velocity of the electron and the magnetic field component of the laser. The impact of this term on the ionization rate, tunnel exit point, momentum at the tunnel exit and electron dynamics is discussed. In the appropriate limit, the results of a nondipole strong-field approximation approach and those of the strict adiabatic limit, where time and field strength are parameters, are consistent. The nondipole strong-field approximation approach is used to identify nonadiabatic modifications of the initial conditions. The results open up an avenue to include nondipole effects in the initial tunneling ionization step in semiclassical models of strong-field and attosecond physics.

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“…Nondipole effects have been identified in a wide range of phenomena, mostly, in strongly driven atoms [8]. For instance, theoretical studies investigated such effects in multielectron ionization of Ne [9], as well as stabilization [10] and high-order harmonic generation [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Signatures of magnetic-field effects in nonsequential double ionization manifesting as backscattering for molecules versus forward scattering for atoms

et al. 2021

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For two-electron diatomic molecules, we investigate magnetic field effects in nonsequential double ionization where recollisions prevail. We do so by formulating a three-dimensional semiclassical model that fully accounts for the Coulomb singularities and for magnetic field effects during time propagation. Using this model, we identify a prominent signature of nondipole effects. Namely, we demonstrate that the recolliding electron backscatters along the direction of light propagation. Hence, this electron escapes opposite to the direction of change in momentum due to the magnetic field. This is in striking contrast to strongly driven atoms where the recolliding electron forward scatters along the direction of light propagation. We attribute these distinct signatures to the different gate that the magnetic field creates jointly with a soft recollision in molecules compared to a hard recollision in atoms. These two different gates give rise, shortly before recollision, to different momenta and positions of the recolliding electron along the direction of light propagation. As a result, we show that the Coulomb forces from the nuclei act to backscatter the recolliding electron in molecules and forward scatter it in atoms along the direction of light propagation.

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Review on non-dipole effects in ionization and harmonic generation of atoms and molecules*

Cited by 28 publications

References 242 publications

Revealing the two-electron cusp in the ground states of He and H2 via quasifree double photoionization

Revealing the two-electron cusp in the ground states of He and H2 via quasifree double photoionization

Nondipole effects in tunneling ionization by intense laser pulses

Signatures of magnetic-field effects in nonsequential double ionization manifesting as backscattering for molecules versus forward scattering for atoms

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