Resonant electron-atom bremsstrahlung in an intense laser field

Zheltukhin, A. N.; Flegel, A. V.; Frolov, M. V.; Manakov, N. L.; Starace, Anthony F.

doi:10.1103/physreva.89.023407

Cited by 22 publications

(32 citation statements)

References 32 publications

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“…The second term in (14) represents the first-order "rescattering" correction to the zero-order result (15). It involves the product of two fieldfree electron-atom scattering amplitudes with lasermodified instantaneous momenta, thus describing electron-atom rescattering (cf.…”

Section: General Results For Labrs Within Tder Theorymentioning

confidence: 99%

“…Using the "rescattering" expansion (14) for the function f p (t), which determines the wave functions Φ (+) pi (r, t) and Φ (−) p f (r, t), we can build the "rescattering" expansion for the LABrS dipole moment d n , representing it in the form:…”

Section: Low-frequency Results For the "Direct" Labrs Amplitude D (Dr) Nmentioning

confidence: 99%

“…As figure 2 shows, the scenario I [panel (a)] considerably contributes over a bounded region of initial (E i ) and final (E f ) electron energies limited by the value 10u p . Moreover, in the region E f E i the amplitude d max for the direct process [14] exceeds the value max E 1 .…”

Section: 43mentioning

confidence: 94%

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Rescattering effects in laser-assisted electron–atom bremsstrahlung

Zheltukhin¹,

Flegel²,

Frolov³

et al. 2015

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

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Abstract.Rescattering effects in nonresonant spontaneous laser-assisted electron-atom bremsstrahlung (LABrS) are analyzed within the framework of time-dependent effective-range (TDER) theory. It is shown that high energy LABrS spectra exhibit rescattering plateau structures that are similar to those that are wellknown in strong field laser-induced processes as well as those that have been predicted theoretically in laser-assisted collision processes. In the limit of a lowfrequency laser field, an analytic description of LABrS is obtained from a rigorous quantum analysis of the exact TDER results for the LABrS amplitude. This amplitude is represented as a sum of factorized terms involving three factors, each having a clear physical meaning. The first two factors are the exact field-free amplitudes for electron-atom bremsstrahlung and for electron-atom scattering, and the third factor describes free electron motion in the laser field along a closed trajectory between the first (scattering) and second (rescattering) collision events. Finally, a generalization of these TDER results to the case of LABrS in a Coulomb field is discussed.

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Section: General Results For Labrs Within Tder Theorymentioning

confidence: 99%

Section: Low-frequency Results For the "Direct" Labrs Amplitude D (Dr) Nmentioning

confidence: 99%

See 1 more Smart Citation

Rescattering effects in laser-assisted electron–atom bremsstrahlung

Zheltukhin¹,

Flegel²,

Frolov³

et al. 2015

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

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show abstract

“…Note that the general parametrization of the one-photon ionization cross section in [44] was presented in a slightly different (but equivalent) form from that in (8) (see Equation (19) in [44]): where…”

Section: Phenomenological Parametrization Of the Molecular Photodetacmentioning

confidence: 99%

“…S29 [17,18] for recombination, and Ref. [19] for bremsstrahlung). Based on this factorized dependence of the probability of a strong field process on the target's photorecombination cross section, a new spectroscopic method has been developed: HHG-based spectroscopy of atoms [20,21] and molecules [22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Photodetachment of a model molecular system by an elliptically polarized field

Frolov

Manakov

Marmo

et al. 2015

Journal of Modern Optics

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The differential cross section for one-photon molecular detachment by an elliptically polarized field is analyzed for a one-electron molecular model comprised of an electron in the field of two (generally nonequivalent) attractive zero-range potentials (ZRPs) separated by the distance R. A phenomenological parametrization of the photodetachment cross section for a fixed-in-space molecular system in terms of two scalar dynamical parameters is presented and circular dichroism effects are discussed. Analytic results for the dynamical molecular parameters within the ZRP molecular model are used to analyze interference phenomena (including two-center interference) and dichroic effects in the detached electron angular distributions and their dependence on the interatomic distance R and on the orientation of the molecular axis with respect to the polarization plane. Numerical ZRP results for angular distributions are presented for both symmetric and asymmetric molecules in an elliptically polarized field.

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Fundamental physical features of resonant spontaneous bremsstrahlung radiation of ultrarelativistic electrons on nuclei in strong laser fields

Roshchupkin

Dubov

et al. 2022

New J. Phys.

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Theoretically predicted fundamental features in the process of resonant spontaneous bremsstrahlung radiation during the scattering of ultrarelativistic electrons with energies of the order ∼ 100 GeV by the nuclei in strong laser fields with intensities up to I ∼ 1024 W cm−2. Under resonant conditions, an intermediate electron in the wave field enters the mass shell. As a result, the initial second-order process by the fine structure constant is effectively reduced to two first-order processes: laser-stimulated Compton effect and laser-assisted Mott process. The resonant kinematics for two reaction channels (A and B) is studied in detail. An analytical resonant differential cross-section with simultaneous registration of the frequency and the outgoing angle of a spontaneous gamma-quantum for channels A and B is obtained. The resonant differential cross section takes the largest value with a small number of absorbed laser photons. In this case, the resonant cross-section is determined by one parameter, depending on the small transmitted momenta, as well as the resonance width. In strong fields, spontaneous gamma quanta of small energies are most likely to be emitted compared to the energy of the initial electrons. At the same time, the angular width of the radiation of such gamma quanta is the largest. With an increase in the number of absorbed laser photons, the resonant cross-section decreases quite quickly, and the resonant frequency of spontaneous gamma quanta increases. It is shown that the resonant differential cross-section has the largest value in the region of average laser fields (I ∼ 1018 W cm−2) and can be of the order of ∼ 1 0 19 in units Z 2 α r e 2 . With an increase in the intensity of the laser wave, the value of the resonant differential cross-section R r e s max decreases and for the intensity I ∼ 1024 W cm−2 is R r e s max ≲ 1 0 7 in units Z 2 α r e 2 . The obtained results reveal new features of spontaneous emission of ultrarelativistic electrons on nuclei in strong laser fields and can be tested at international laser installations.

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Resonant electron-atom bremsstrahlung in an intense laser field

Cited by 22 publications

References 32 publications

Rescattering effects in laser-assisted electron–atom bremsstrahlung

Rescattering effects in laser-assisted electron–atom bremsstrahlung

Photodetachment of a model molecular system by an elliptically polarized field

Fundamental physical features of resonant spontaneous bremsstrahlung radiation of ultrarelativistic electrons on nuclei in strong laser fields

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