Photon Angular Distribution in Two-Photon Electron Capture by H-Like Uranium

TL;DR

This study investigates the angular distribution of photons emitted during two-photon electron capture by H-like uranium ions, highlighting interference effects between dielectronic recombination and radiation recombination channels.

Contribution

It provides a detailed analysis of the photon angular distribution beyond the single-photon approximation, considering interference effects in two-photon processes.

Findings

Strong interference observed between DR and RR channels.

Angular distribution varies significantly with incident electron energy.

Cascade transitions involving (1s2s) and (1s2p) states dominate the emission spectrum.

Abstract

We present a comprehensive study of the angular distribution of photons emitted during the resonant two-photon electron capture by H-like uranium ions. Focusing on the energies of incident electrons, at which the dielectronic recombination (DR) dominates, we analyze the angular emission spectrum of the most significant cascade transitions, which make the main contribution to the total cross section. In particular, we consider the cascade transitions that occur with the formation of $(1s2s)$ and $(1s2p)$ intermediate states. We investigate the angular distribution of the emitted photons beyond the single-photon approximation. We separately consider the contributions of the DR and the radiation recombination (RR) channels and demonstrate that the two-photon angular distribution shows strong interference between these channels.