Al K-shell x-ray production cross section induced by proton and highly charged heavy ions

Abstract

Al K-shell x-ray production cross sections induced by 50-250 keV protons and 1-3 MeVAr 11+ ions were measured. It was found that 3-4 L-shell electrons of the Al atom were multiply ionized by Ar 11+ ion impact. The x-ray production cross sections were deduced from the experimental yield data and compared with binary encounter approximation (BEA), plane wave Born approximation and energy-loss Coulomb-repulsion perturbed-stationary-state relativistic (ECPSSR) theoretical predictions. For proton impact, the ECPSSR theory gave an accurate prediction of the experimental result. However, taking into account the multiple-ionization effect on fluorescence yield, the BEA model presented better agreement with the cross section data produced by Ar 11+ ions.

Semi-empirical parameterization of HI/p L-shell X-ray production cross section ratios in Bi for Heavy Ion PIXE

“…recoil production. Due to Multiple Ionisation effects, enhanced X-ray production cross sections at the same projectile velocity as protons mean that PIXE using heavy ions may in some cases yield comparable X-ray fluorescence for low velocity heavy ions below 1 MeV/nucleon as with faster protons 7 – 9 . This is because, fundamentally, protonic ionisation, largely due to the deflection of the proton nuclear charge about the target nuclear mean field, is not the same as that which is due to heavier ions.…”

Multiple ionization state of Arq+ ions during collisions near the Bohr velocity

“…The interaction of highly charged ions (HCI) with solid target has been intensively investigated in recent years, not only for the significance of basic researches such as, astrophysics, atomic physics and ion-atom collisions reactive dynamics under extra conditions, but also for the requirement of practical applications in many fields, i.e., biomedicine, material science and new energy development technology 1–5 . X-ray emission, which is one of the important consequential results from ion-atom collisions, contains important information of several inner-shell processes as primary ionization, vacancy decay and intra-atomic excitation, and provides a valid method to investigate the particle properties and complex interaction mechanism 6,7 . For example, many works have been carried out focusing on the excitation and decay of the highly charged Ar ions by analyzing the K-shell x-ray emission 8–21 .…”