Plateau Structure in Resonant Laser-Assisted Electron-Atom Scattering

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

doi:10.1103/physrevlett.102.103201

Cited by 8 publications

(12 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results in this paper become inapplicable for resonant electron energies, E ≈ µhω − |E 0 | − u p , at which the electron may be temporarily captured in a bound state ψ κlm l (r) of the potential U (r) by emitting µ photons [43], and for threshold energies, E = khω, k = 1,2, . .…”

Section: Discussionmentioning

confidence: 97%

Analytic description of elastic electron-atom scattering in an elliptically polarized laser field

et al. 2013

Self Cite

View full text Add to dashboard Cite

Flegel, A. V.; Frolov, M. V.; Manakov, N. L.; Starace, Anthony F.; and Zheltukhin, A. N., "Analytic description of elastic electron-atom scattering in an elliptically polarized laser field" (2013 An analytic description of laser-assisted electron-atom scattering (LAES) in an elliptically polarized field is presented using time-dependent effective range (TDER) theory to treat both electron-laser and electron-atom interactions nonperturbatively. Closed-form formulas describing plateau features in LAES spectra are derived quantum mechanically in the low-frequency limit. These formulas provide an analytic explanation for key features of the LAES differential cross section. For the low-energy region of the LAES spectrum, our result generalizes the Kroll-Watson formula to the case of elliptic polarization. For the high-energy (rescattering) plateau in the LAES spectrum, our result generalizes prior results for a linearly polarized field valid for the high-energy end of the rescattering plateau [Flegel et al., J. Phys. B 42, 241002 (2009)] and confirms the factorization of the LAES cross section into three factors: two field-free elastic electron-atom scattering cross sections (with laser-modified momenta) and a laser field-dependent factor (insensitive to the scattering potential) describing the laser-driven motion of the electron in the elliptically polarized field. We present also approximate analytic expressions for the exact TDER LAES amplitude that are valid over the entire rescattering plateau and reduce to the three-factor form in the plateau cutoff region. The theory is illustrated for the cases of e-H scattering in a CO 2 -laser field and e-F scattering in a midinfrared laser field of wavelength λ = 3.5 µm, for which the analytic results are shown to be in good agreement with exact numerical TDER results.

show abstract

Section: Discussionmentioning

confidence: 97%

Analytic description of elastic electron-atom scattering in an elliptically polarized laser field

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…This latter momentum ensures the condition for the electron return by the laser field back to the atom at the time moment t, followed by the recollision. We note that the saddle points t ′ k are functions of the time t (t ′ k ≡ t ′ k (t)) implicitly defined by equation (22).…”

Section: Low-frequency Analysis Of the Labrs Amplitudementioning

confidence: 99%

“…Both equations (34) and (35) follow from the saddle point equation (22). Let us consider now the rescattering approximation for the dipole momentd n given by (13).…”

Section: Of the Labrs Amplitudementioning

confidence: 99%

Rescattering effects in laser-assisted electron–atom bremsstrahlung

Zheltukhin¹,

Flegel²,

Frolov³

et al. 2015

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

View full text Add to dashboard Cite

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.

show abstract

“…For example, significant enhancements of the cross sections for laser-assisted electron-atom scattering accompanied by absorption or emission of laser quanta was predicted in Ref. [6]. Also, the occurrence of resonant enhancements (by orders of magnitude) of the high-energy part of laser-assisted radiative recombination (LARR) or laser-assisted radiative attachment (LARA) spectra have been predicted in Ref.…”

Section: Introductionmentioning

confidence: 97%

Resonant electron-atom bremsstrahlung in an intense laser field

et al. 2014

Self Cite

View full text Add to dashboard Cite

Zheltukhin, A. N.; Flegel, A. V.; Frolov, M. V.; Manakov, N. L.; and Starace, Anthony F., "Resonant electron-atom bremsstrahlung in an intense laser field" (2014 We analyze a resonant mechanism for spontaneous laser-assisted electron bremsstrahlung (BrS) involving the resonant transition (via either laser-assisted electron-ion recombination or electron-atom attachment) into a laser-dressed intermediate quasibound state (corresponding, respectively, to either a field-free neutral atom or a negative-ion bound state) accompanied by ionization or detachment of this state by the laser field. This mechanism leads to resonant enhancement (by orders of magnitude) of the BrS spectral density for emitted photon energies corresponding to those for laser-assisted recombination or attachment. We present an accurate parametrization of the resonant BrS amplitude in terms of the amplitudes for nonresonant BrS, for recombination or attachment to the intermediate state, and for ionization or detachment of this state. The high accuracy of our general analytic parametrization of the resonant BrS cross section is shown by comparison with exact numerical results for laser-assisted BrS spectra obtained within time-dependent effective range theory. Numerical estimates of resonant BrS in electron scattering from a Coulomb potential are also presented.

show abstract

Plateau Structure in Resonant Laser-Assisted Electron-Atom Scattering

Cited by 8 publications

References 12 publications

Analytic description of elastic electron-atom scattering in an elliptically polarized laser field

Analytic description of elastic electron-atom scattering in an elliptically polarized laser field

Rescattering effects in laser-assisted electron–atom bremsstrahlung

Resonant electron-atom bremsstrahlung in an intense laser field

Contact Info

Product

Resources

About