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Chinese Physics B 2013年第10期22卷 252-256页

作者：周满邹贤容赵磊陈熙萌王诗尧周旺邵剑雄 School of Nuclear Science and Technology Lanzhou University

In this paper, we present a simple theoretical approach to calculate the multiple ionization of big atoms and molecules induced by very high-q fast projectiles in a strong coupling regime （q/v 〉 1）. The results obtained from this approach are in excellent agreement with the available experimental data. A probable scenario of molecular multiple ionization by fast and very high-q projectiles is discussed. The very small computational time required here and the good agreement with the existing experimental data make it a good candidate for studying the multiple ionization of complex molecules under high linear energy transfers.

关键词： multiple ionization high-q projectiles strong coupling regime model calculation

multiple ionization of argon accompanied by electron loss and capture of 0.22-6.35 MeV C^q＋ ions

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Chinese Physics B 2007年第8期16卷 2378-2383页

作者：陈林陈熙萌邵剑雄鲁彦霞丁宝卫崔莹高志民刘玉文杜娟谢江山孙光智刘兆远 Department of Modern Physics Lanzhou University Lanzhou 730000 China

In this paper a projectile ions recoil ions coincidence technique is employed to investigate the target ionization and projectile charge state changing processes in the collision of 0.22-6.35 MeV Cq^＋（q = 1 - 4） ions with argon atoms. The partial cross section ratios of the double, triple, quadruplicate ionization to the single ionization （or the single capture） of argon associated with single electron loss （or single electron capture） by the projectile are measured and compared with the previous experimental results. In the present experiment, it is observed that the ratios of ionization cross sections R associated with single loss and single capture depend strongly on the projectile charge state and vary significantly with different reaction channels as impact energy increases. In addition, this paper gets empirical scaling laws for the ionization cross section ratios R corresponding to the projectile single loss and finds that the ratios of the double ionization to the single ionization associated with single electron capture remain constant in the present energy range.

关键词： multiple ionization electron loss electron capture ion-atom collisions

Numerical study of the effect of aft-loaded magnetic field on multiple ionizations in Hall thruster

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Plasma Science and Technology 2022年第7期24卷 45-52页

作者：曾德迈李鸿刘金文丁永杰魏立秋于达仁毛威 Lab of Plasma Propulsion Harbin Institute of TechnologyHarbin 150001People's Republic of China Key Laboratory of Aerospace Plasma Propulsion Ministry of Industry and Information TechnologyHarbin 150001People's Republic of China Qingdao Haier Smart Technology Qingdao 266100People's Republic of China Beijing Institute of Control Engineering Beijing 100190People's Republic of China

It is assumed that the shift of a strong magnetic field region with a positive gradient from exit plane to outside, namely the transit from a normal loaded magnetic field to an aft-loaded one, enhances the multiple ionization process in the magnetically shielded Hall thruster. To confirm this conjecture, a comparative study is carried out numerically with a particle-in-cell method. The simulation results prove that compared with the normal loaded magnetic field, the application of aft-loaded magnetic field enhances the multiple ionization process. This study further analyzes the ionization characteristics of the transition from low-charged ions to high-charged ions under two magnetic field conditions and the influence of the magnetic strength of aft-loaded magnetic field on the multiple ionization characteristics. The study described herein is useful for understanding the discharge characteristics of Hall thruster with an aft-loaded magnetic field.

关键词： Hall thruster aft-loaded magnetic field multiple ionization electron temperature

Nd L-shell x-ray emission induced by light ions

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Chinese Physics B 2022年第6期31卷 310-315页

作者：周贤明尉静程锐陈燕红梅策香曾利霞柳钰张艳宁梁昌慧赵永涛张小安 Ion Beam and Optical Physics Joint Laboratory of Xianyang Normal University and Insitite of Modern Physics Chinese Academy of SciencesXianyang Normal UniversityXianyang 712000China School of Science Xi’an Jiaotong UniversityXi’an 710049China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

The L-shell x-ray of Nd has been obtained for 300-600 keV He2+ions impacting,and compared with that produced by H+and H2+*** threshold of projectile kinetic energy for L-shell ionization of Nd is crudely verified in the energy region of about 300-400 *** is found that the energy of the distinct L-subshell x-rays has a blue *** relative intensity ratios of Lβ_(1,3,4)and Lβ_(2,15)to Lα_(1,2)x-ray are enlarged compared to the atomic data,and they decrease with the increase of the incident energy,and increase with increasing the effective nuclear charge of the incident *** is interpreted by the multiple ionization of outer-shells induced by light ions.

关键词： light ions ion-atom collision L-shell x-ray multiple ionization

Studies of K-shell x-ray energy shifts induced by MeV/u heavy ions

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Chinese Physics B 2009年第4期18卷 1443-1450页

作者：宋张勇杨治虎邵剑雄崔莹张红强阮芳芳杜鹃高志民于得洋陈熙萌蔡晓红 Institute of Modern Physics the Chinese Academy of Sciences School of Nuclear Science and Technology Lanzhou University

This paper reports that the K x-ray spectra of the thin target 4TAg, 4sCd, 49In and 50Sn were measured by an HPGe semi-conductor detector in collisions with 84.5 MeV 6C4＋ ions. Our experiment revealed the Kα x-ray energy shifts were not obvious and the Kβ1 x-ray energy shifts were about 90-110 eV. The simple model of Burch et al has been previously used to calculate the K x-ray energy shifts due to an additional vacancy in 2p orbit. The present work extends the model of Burch to calculate the x-ray energy shifts of multiple ionized atoms induced by heavy ions with kinetic energy of MeV/u. In addition to our experimental results, many other experimental results are compared with the calculated values by using the model.

关键词： K-shell x-ray energy shifts heavy ion collisions multiple ionization