Free-free transitions in a bichromatic field of frequencies $\omega $ and $2\omega$ at moderate field intensities

TL;DR

This paper investigates free-free transitions in laser-assisted electron-hydrogen scattering within a bichromatic field of frequencies ω and 2ω at moderate intensities, using a hybrid theoretical approach to analyze angular distributions and phase effects.

Contribution

It introduces a hybrid method combining exact and perturbative treatments to study laser-assisted scattering with bichromatic fields, focusing on target dressing and phase influence.

Findings

Angular distributions are computed for specific geometries and frequencies.

The relative phase between the two fields significantly affects scattering outcomes.

Target dressing effects are crucial in the studied frequency regime.

Abstract

Free-free transitions in laser-assisted electron-hydrogen scattering in a bichromatic field of frequencies $\omega $ and $2\omega $ are studied at moderate intensities for fast projectiles. A hybrid approach is used, in which the field-projectile interaction is described exactly but the field-target one is described by second order perturbation theory; the projectile-target interaction is treated in the first Born approximation. The adopted description of the target enables a consistent study of the leading process to each of the considered sidebands. Numerical results are presented for the angular distributions in a geometry and at frequencies for which the target dressing is important. The influence of the relative phase between the fields is investigated, too.