Electron scattering in intense laser fields

Weingartshofer, A.; Holmes, J K; Sabbagh, J.; Chin, S. L.

doi:10.1088/0022-3700/16/10/016

Cited by 142 publications

(64 citation statements)

References 22 publications

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“…Previous work [32] has shown that the agreement between theory and early experiments with a strongly focused laser [33] can be improved by taking into account the spatial N γ = 1 Figure 7. Signals calculated using the low-frequency approximation for various peak intensities, averaged over the interaction volume.…”

Section: Influence Of the Angle Between The Incident Electron Momentumentioning

confidence: 89%

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Experimental and theoretical study of free–free electron–helium scattering in a CO₂laser field

Nehari

Holmes

Dunseath

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. Free-free transitions during the scattering of electrons by helium in the presence of a linearly polarized CO 2 laser field are investigated both experimentally and theoretically. Signals for laser-assisted scattering at 22 eV with absorption or emission of up to two photons are measured at scattering angles between 20 o and 70 o , and are compared to the values obtained from an 11-state R-matrix Floquet calculation as well as using the low-frequency approximation of Kroll and Watson. The two sets of theoretical results are found to be in very good agreement for the scattering geometries considered in the experiment. The order of magnitude of the experimental results is reproduced by calculations with intensities in the region of 10 7 W cm −2 . Agreement is improved by averaging the theoretical results over the spatial distributions of the three beams as well as the temporal intensity profile of the laser pulse, and by allowing for some misalignment of the three beams in the experiment.

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Section: Influence Of the Angle Between The Incident Electron Momentumentioning

confidence: 89%

“…In the low-frequency approximation, averaging over the spatial distribution of the three beams as well as over the temporal profile of the laser pulse corresponds to replacing the square of the Bessel function in equation (2) by [33,34] …”

Section: Influence Of the Angle Between The Incident Electron Momentumentioning

confidence: 99%

Experimental and theoretical study of free–free electron–helium scattering in a CO₂laser field

Nehari

Holmes

Dunseath

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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“…The available body of experimental data is confined to processes in which the target atom remains in its ground state and the projectile absorbs or emits one or more photons (free-free transitions; e.g. Weingartshofer et al [3]). In this paper we shall discuss the simultaneous offshell excitation of an atom by an electron and a photon [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous electron-photon excitation of hydrogen and helium

et al. 1984

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Total and differential cross sections for simultaneous excitation of H(2s), H(3s) and He(ls2s) by electron impact in the presence of a photon field have been calculated in second-order perturbation theory. The characteristics of the results are interpreted in terms of their physical origin. The off-shell excitation cross section for the He(ls2s) state is found to be one order of magnitude smaller than that for excitation of the H(2s) state. This is consistent with our expection that atoms with higher dipole-polarisability should favour larger off-shell cross sections for transitions between s-states.

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“…Several experiments have been performed, in which the exchange of one or more photons between the electron-atom system and the laser field has been observed in laser-assisted elastic [1] or inelastic [2][3][4] electron-atom collisions. It is therefore not unreasonable to expect that similar experiments will be carried out in the future for laser-assisted (e, 2e) reactions.…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted (e, 2e) collisions in helium

Joachain

Makhoute

Maquet

et al. 1992

Z Phys D - Atoms, Molecules and Clusters

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Atoms, MoleculesAbstract. The influence of a strong laser field on the dynamics of fast (e, 2e) collisions in helium is analyzed in the asymmetric, coplanar geometry. The interaction of the laser field with the incident, scattered and ejected electrons is treated in a non-perturbative way, while the remaining interactions are treated by using first order perturbation theory. Detailed calculations are performed for an incident electron energy Ekl = 600 eV, an ejected electron energy Eke = 5 eV and a scattering angle 0 A = 4 °.The influence of the laser parameters (photon energy, intensity and direction of polarization) on the angular distribution of the ejected electron is analyzed. We find that in general the triple differential cross sections are strongly dependent on the dressing of the projectile and the target by the laser field.

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Electron scattering in intense laser fields

Cited by 142 publications

References 22 publications

Experimental and theoretical study of free–free electron–helium scattering in a CO₂laser field

Experimental and theoretical study of free–free electron–helium scattering in a CO₂laser field

Simultaneous electron-photon excitation of hydrogen and helium

Laser-assisted (e, 2e) collisions in helium

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Electron scattering in intense laser fields

Cited by 142 publications

References 22 publications

Experimental and theoretical study of free–free electron–helium scattering in a CO2laser field

Experimental and theoretical study of free–free electron–helium scattering in a CO2laser field

Simultaneous electron-photon excitation of hydrogen and helium

Laser-assisted (e, 2e) collisions in helium

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Experimental and theoretical study of free–free electron–helium scattering in a CO₂laser field

Experimental and theoretical study of free–free electron–helium scattering in a CO₂laser field