Laser-assisted electron-argon scattering at small angles

Abstract

Electron-argon scattering in the presence of a linearly polarized, low frequency laser field is studied theoretically. The scattering geometries of interest are small angles where momentum transfer is nearly perpendicular to the field, which is where the Kroll-Watson approximation has the potential to break down. The Floquet R matrix method solves the velocity gauge Schrödinger equation, using a larger reaction volume than previous treatments in order to carefully assess the importance of the long range polarization potential to the cross section. A comparison of the cross sections calculated with the target potential fully included inside 20 and 100 a.u. shows no appreciable differences, which demonstrates that the long range interaction can not account for the high cross sections measured in experiments.

Laser-assisted electron scattering on a nano-sphere

“…We note that this quantity also appears in recent works on laser-assisted electron scattering, see e.g., Refs. [11,12].…”

“…Recently the application of this process has received a growing importance in various branches of research aiming, for instance, the generation of ultrashort (even attosecond) electron pulses [2,3,4], four-dimensional imaging and ultrafast electron microscopy [5,6], or photon-induced near field electron microscopy [7,8,9]. The theoretical description of laser-assisted scattering processes of charged particles relies on the non-perturbative treatment of the interaction with the laser field [10,11,12], which is usually based on the Volkov states being modified de Broglie plane waves. The exact analytic treatment of this problem has already been carried out in an earlier study by one of the authors [10], and several closed-form results have been derived there.…”

Two-photon laser-assisted electron scattering on hydrogen atom

“…In some of them, the difference between the experimental data and the results of the KWA was attributed to the possible inaccuracy of the calculations carried out in [2]. However, in the paper by Morrison and Greene [19], the LAES cross section for the scattering of electrons with an energy of 10eV on Ar atoms was calculated using the R-matrix method and excellent agreement with the analytical results of Kroll and Watson was obtained. Therefore, there are no grounds for doubting the validity of the KWA.…”

Quantum mechanical scattering by time-periodic potentials

“…We note that a similar integral also appears in recent works on laser-assisted electron scattering, see e.g., Refs. [73,74]. Since the scattered wave function is built up by sums of spherical Volkov states, using Eqs.…”

“…Recently, the application of this process has received a growing importance in various branches of research aiming, for instance, the generation of ultrashort (even attosecond) electron pulses [67][68][69], four-dimensional imaging and ultrafast electron microscopy [70,71], or photon-induced near field electron microscopy [36,50,72]. The theoretical description of laser-assisted scattering processes of charged particles relies on the nonperturbative treatment of the interaction with the laser field [61,73,74], which is usually based on Volkov states (see Chapter 2).…”