Laser-Assisted (e, 2e) Collisions in the Symmetric/Asymmetric Coplanar Geometry

Abstract

In this review, we present a comprehensive survey of laser-assisted (e, 2e) reactions. The influence of a laser field on the dynamics of (e, 2e) collisions in atomic hydrogen is analyzed in the symmetric and asymmetric coplanar geometries. Particular attention is devoted to the construction of the dressed (laser-modified) target wave functions, in both the initial and final states. The calculation is performed in the framework of Coulomb-Volkov-Born approximation, where the initial and final electrons are described by Volkov wave functions, while the interaction of the incident electron with the target atom is treated in the first and the second Born approximation. The state of the ejected electron is described by a Volkov/Coulomb-Volkov wave function. A detailed account is also given of the techniques we have used to evaluate the scattering amplitudes. The influence of the laser parameters (frequency, intensity, and direction of polarization) on the angular distribution of the ejected electron is discussed, and a number of illustrative examples are given. The structure of the triple differential cross section in the vicinity of resonances is also analyzed.

Quest for New Data: Ionizing Radiation Metrology in the Presence of Laser-Assisted Scattering Processes

“…This method is usually dubbed the Second-Born Approximation (SBA). SBA has been shown, in the literature, to be crucial for correctly taking into account the laser-dressing of the wave function [9].…”

“…A useful element for our speculative treatment on the effect of laser-light excitation in particle scattering is reported in [9]. The article reviews the calculation of the ionization TDCS of a simple atomic system exploiting first-and Second-Born approximations.…”

“…Blue, dotted line: results obtained by ignoring the dressing of the target. (a) l = 0: no-photon net exchange; (b) l = 1 one photon absorption;(c) l = −1 one photon emission (taken from[9]).…”

Simultaneous Excitation of Helium by Means of an Electron and a Photon: A Joined Experimental and Theoretical Study

“…On the theoretical side, most of the calculations were performed on the basis of the first-order Born approximation in which the atomic target involved either a single active electron or two active electrons [20][21][22]. Although this approximation is valid only at high electron energies, it has been shown to provide new insights into the inelastic scattering process assisted by laser fields, in particular in the regime where the perturbation theory for laser-atom interactions breaks down.…”

Elastic scattering of a muon neutrino by an electron in the presence of a circularly polarized laser field

“…G. Mourou and D. Strickland were jointly awarded the 2018 Nobel Prize in Physics for inventing the use of chirped pulse amplification (CPA) as a means to generate high-intensity and ultra-short optical pulses [7,8]. Meanwhile, scientists have been enthusiastic and focused on the study of laser-assisted quantum processes, whether in quantum electrodynamics (QED) [9][10][11][12], electroweak theory [13][14][15][16][17] or atomic physics [18][19][20][21], and generally on the study of the laser-matter interactions [22,23]. In parallel with the production of the high-power femtosecond lasers, experimental testing of these studies became feasible [24][25][26].…”