The continuous and discrete molecular orbital x-ray bands from Xe(q+) (12≤q≤29) +Zn collisions.

Yipan Guo,Zhangyong Song,Zhihu Yang,Xiangli Wang,Boli Zhang,Jie Yang,Qiumei Xu,Bitao Hu,Bian Yang,Jing Chen

doi:10.1038/srep30644

Abstract

In this paper, the x-ray emissions are measured by the interaction of 1500–3500 keV Xeq+ (q = 12, 15, 17, 19, 21, 23, 26 and 29) ions with Zn target. When q < 29, we observe Ll, Lα, Lβ1, Lβ2 and Lγ characteristic x-rays from Xeq+ ions and a broad M-shell molecular orbital (MO) x-ray band from the transient quasi-molecular levels. It is found that their yields quickly increase with different rates as the incident energy increases. Besides, the widths of the broad MO x-ray bands are about 0.9–1.32 keV over the energy range studied and are proportional to v1/2 (v = projectile velocity). Most remarkably, when the projectile charge state is 29, the broad x-ray band separates into several narrow discrete spectra, which was never observed before in this field.

Highlights

In this paper, the x-ray emissions are measured by the interaction of 1500–3500 keV Xeq+ (q = 12, 15, 17, 19, 21, 23, 26 and 29) ions with Zn target
According to the Fano-Lichten description of heavy-ion collisions, we know that radiative decay of the vacancies can occur during the molecular orbital (MO) formation process, and the emitted x-ray spectra have a broad full widths at half-maximum (FWHM) and end point energy (EPE) that matches with the united atom (UA) characteristic x-ray energy
One can see that the FWHM of the band M is proportional to the square root of the projectile velocity

Summary

Introduction

For slow highly charged ion interactions with the target, quasi-molecular states that are formed during collisions have proved to be successful in qualitative describing electron-vacancy exchange processes[6,7,8,9,10,11,12]. The precise theoretical calculations in electron promotion and MO transition processes are still lacking for slow highly charged ion-atom collisions.

Results

Conclusion