K-shell ionization cross section of aluminium induced by low-energy highly charged argon ions

• Published in: The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2007-02, Vol.41 (2), p.281-286
• Main Authors: CHEN, X. M, SHAO, J. X, YANG, Z. H, ZHANG, H. Q, CUI, Y, XU, X, XIAO, G. Q, ZHAO, Y. T, ZHANG, X. A, ZHANG, Y. P
• Format: Article
• Language: English
• Subjects: Aluminum; Argon ions; Atomic and molecular collision processes and interactions; Atomic and molecular physics; Atomic properties and interactions with photons; Coupling (molecular); Exact sciences and technology; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Interactions of atoms, molecules and their ions with surfaces; photon and electron emission; neutralization of ions; Ionization cross sections; Multiphoton ionization and excitation to highly excited states (e.g., rydberg states); Photon interactions with atoms; Physics; Scattering of atoms, molecules and ions; Vacancies; X- and γ-ray instruments and techniques; X- and γ-ray sources, mirrors, gratings and detectors
• ISSN: 1434-6060; 1434-6079
• DOI: 10.1140/epjd/e2006-00233-9

Al K-shell X-ray yields are measured with highly charged Arq+ ions (q=12–16) bombarding against aluminium. The energy range of the Ar ions is from 180 to 380 keV. K-shell ionization cross sections of aluminium are also obtained from the yields data. The experimental data is explained within the framework of 2pπ -2pσ rotational coupling. When Ar ions with 2p-shell vacancies are incident on aluminium, the vacancies begin to reduce. Meanwhile, collisions against Al atoms lead to the production of new 2p-shell vacancies of Ar ions. These Ar 2p-shell vacancies will transfer to the 1s orbit of an Al atom via 2pπ-2pσ rotational coupling leading to the emission of a K-shell X-ray of aluminiun. A model is constructed based on the base of the above physical scenario. The calculation results of the model are in agreement with the experimental results.