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

Abstract

In order to clarify the mechanism and the influence of the initial charge state and target atomic parameters for the formation of L-shell multiple ionization state of Ar q+ ions produced by the collisions near the Bohr velocity, the k-shell x-ray emission of Ar is measured for 1.2 MeV Ar q+(q=4, 6, 8, 9, 11, 12) ions impacting on V target and 3 MeV Ar 11+ ions interacting with selected targets (Z 2 = 23, 26, 27, 28, 29, 30). It is found that the measured Ar Kα and Kβ x-ray energies shift to the high energy side, and the relative intensity ratios of Kβ/Kα are enlarged than the atomic data, owing to the presence of out-shell multiple vacancies. The multiple ionization is almost independence of the projectile charge state, but is diminished with increasing target atomic number.

X-ray emission for Ar11+ ions impacting on various targets in the collisions near the Bohr velocity*

“…5 and 6 in Ref. [44], it was found that the x-ray energy of Ar K α and K β and the relative intensity ratio of K β to K α are all dwindled along with the target atomic number. This means that the multiple-ionization degree of Lshell decreases with the increase of target atomic number.…”

“…Although the Ar L-shell x-rays were not observed in the present work, the ionization of L-shell electrons can be deduced from the K-shell x-ray emission. In the previous work, [44] we investigated the characteristic of Ar K-shell xray. As shown in Figs.…”

Projectile energy dependence of L X-ray emission in collisions of Xe23+ with In target: role of Coulomb ionization and quasi-molecular effects

“…The number of incident ions on the target was monitored temperally with a calibrated transmitting Faraday cup. More experimental details can be found in Zhou et al (2019).…”