Saturation effect in projectile- and target- x-ray production in collisions between 2.5 MeV/u highly charged Cu ions and gaseous targets

Abstract

L x-ray production cross sections have been measured for highly charged 2.5 MeV/u Cuq+ (q = 20–26) ions colliding with H2, Ne, Ar, Kr and Xe target atoms. The observed Cu L x-rays are due to the excitation and electron-transfer processes. The charge state dependence of the projectile L x-rays has been studied with Ar and Kr targets. We have derived the subshell resolved K-L1, K-L2 and K-L3 electron-transfer cross sections from the measured Ar K x-ray yields as a function of L vacancies in Cu ion. The measured projectile L x-ray production cross sections arising from the excitation and electron capture are found to saturate as target atomic number Zt increases. Similarly, a saturation has also been found in the Ar K-shell ionization cross sections as a function of Zp.

Production of projectile and targetK-vacancy in near-symmetric collisions of 60–100 MeV Cu9+ions with thin Zn target

“…In searching for a more accurate origin of the Cu 9+ ions 1s-vacancies, first, the experimental ionization cross sections, σ (cm 2 /atom), are given, which are deduced from the relation [20,21] σ = 4πA…”

L3subshell alignment in bismuth induced by swift silicon ions

“…The study of inner shell processes is important to understand the details of the atomic collision mechanisms. Various inner shell phenomenon such as K, L, M-shell ionization and stateselective electron transfer [1], radiative electron capture [2,3], collective excitation in ion-solid [4] and ion-cluster [5] collisions, physics of doubly excited states [6], saturation effect [7,8] etc have been investigated over the years using high, as well as low, resolution x-ray detection techniques. The accurate derivation of the inner shell ionization cross-section needs the knowledge of angular distributions and also if there is any angular anisotropy involved in the x-rays, particularly in case of L and M-subshell x-rays.…”