Angular distribution of K{\alpha} x rays following nonradiative double electron capture in relativistic collisions of Xe54+ ions with Kr and Xe atoms

TL;DR

This study investigates the angular distribution of Kα x rays following nonradiative double electron capture in relativistic Xe ion collisions, revealing anisotropic patterns sensitive to collision energy and target atom type.

Contribution

It provides the first detailed measurement of angular distributions of Kα radiation after nonradiative double electron capture in relativistic ion-atom collisions.

Findings

Kα1 radiation is anisotropic and energy-dependent.

Kα2 radiation is isotropic.

Differences observed between single and double electron capture processes.

Abstract

We present experimental study of nonradiative double electron capture processes in collisions of 95 and 146 MeV/u bare xenon ions with krypton and xenon gaseous atoms at the HIRFL-CSR storage ring. Angular distributions of the characteristic K{\alpha} radiation of the down-charged projectile ions Xe52+* are measured, which are closely related to the magnetic sublevel population of the excited 1s2l_j states of Xe52+*. It was found that the K{\alpha}1 radiation shows pronounced anisotropic and is sensitive to the collision energies and the target atoms, whereas the K{\alpha}2 radiation gives rise to isotropic. Moreover, obviously difference in the anisotropy parameters of Lyman-{\alpha}1 of Xe53+* ions and K{\alpha} transitions of Xe52+* ions separately following nonradiative single and double electron capture into the L-shell levels of projectiles is obtained and discussed.