Effect of Interaction Potential on Laser-assisted e-Ar Scattering

Wang, Xiaofei; Qiu-Bo, Hu; Sun, J. F.

doi:10.1088/1674-0068/25/03/277-280

Cited by 1 publication

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following this, multiple experimental studies appeared mostly at non-critical geometries using Ti:sapphire lasers at λ = 800 nm [37,38] and Nd:YAG lasers λ = 1064 nm [39][40][41], some searching for dressed atom effects for different atomic targets. After these more recent experimental results, a number of theoretical works have appeared including considerations of electron-exchange, short-and long-range interactions [42], an evaluation of the long-range polarization potential through Floquet R-matrix theory [43], a Born-Floquet method approach [44], including atomic form factors [45] and examining second-order Born contributions [46,47]. However, we think it is fair to say that still no simple and general explanation for the experimental data at critical geometries has emerged.…”

Section: Introductionmentioning

confidence: 99%

Nondipole effects in laser-assisted electron scattering

Jensen

Madsen

2020

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

View full text Add to dashboard Cite

Laser-assisted electron scattering is often described using the electric dipole approximation for the interaction between the electron and the assisting electromagnetic field. Within the dipole approximation, theory predicts a vanishing scattering cross section for processes involving exchange of photons in critical geometries, where the electron momentum transfer vector is perpendicular to the linear polarisation of the external field. In a nonrelativistic spin-free treatment, we consider modifications of the scattering cross section by nondipole contributions to the first order in 1/c in the interaction between the laser field and the electron using the nondipole strong-field-approximation Hamiltonian [Jensen et al. Phys. Rev. A. 101, 043408 (2020)]. The approach allows for an analytical solution for the wave function of a free electron in the laser field with a nondipole contribution.This wave function leads to an analytical formula for the laser-assisted scattering cross section including nondipole effects. The nondipole corrections depend on the propagation direction of the field relative to the electron momentum transfer vector. The approach gives a finite cross section in scattering geometries, where the dipole approach predicts a vanishing cross section. The theory is illustrated by application to scattering geometries similar to those considered in experiments where large deviations between experimental data and predictions based on the dipole approximation have been reported. In these scattering geometries, the nondipole strong-field-approximation approach suggests an increase in the cross section by orders of magnitude compared to results obtained within the dipole approximation.

show abstract