Classical and Quantum Phenomenology in Radiation by Relativistic Electrons in Matter or in External Fields

TL;DR

This paper reviews the phenomenological aspects of radiation emitted by relativistic electrons in various external environments, highlighting quantum and classical effects such as recoil, spin, coherence, and tunnelling.

Contribution

It provides a comprehensive overview of both classical and quantum phenomena influencing radiation processes in matter and external fields, integrating recent theoretical insights.

Findings

Infrared divergence and coherence length effects are significant in radiation processes.

Quantum recoil and spin effects alter radiation characteristics at high energies.

Phenomena like shadowing and electron side-slipping impact radiation emission in structured media.

Abstract

Phenomenological aspects of radiation by relativistic electrons in external field, in matter or the vicinity of matter are reviewed, among which: infrared divergence, coherence length effects, shadowing, enhancement in aligned crystals, quantum recoil and spin effects, electron side-slipping, photon impact parameter and the presence of tunnelling in the radiation process.