高电荷态Ar^(8+)离子与He原子碰撞中双电子俘获量子态选择截面实验研究  

Experimental measurement of state selective double electron capture in collision between 1.4-20 keV/u Ar^(8+) with He

作　　者：吴怡娇 孟天鸣 张献文 谭旭 马蒲芳 殷浩 任百惠 屠秉晟 张瑞田[2] 肖君 马新文[2] 邹亚明[1] 魏宝仁[1] Wu Yi-Jiao;Meng Tian-Ming;Zhang Xian-Wen;Tan Xu;Ma Pu-Fang;Yin Hao;Ren Bai-Hui;Tu Bing-Sheng;Zhang Rui-Tian;†Xiao Jun;Ma Xin-Wen;Zou Ya-Ming;Wei Bao-Ren(Key Laboratory of Nuclear Physics and Ion Beam Application of the Ministry of Education,Institute of Modern Physics,Fudan University,Shanghai 200433,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]复旦大学现代物理研究所,核物理与离子束应用教育部重点实验室,上海200433 [2]中国科学院近代物理研究所,兰州730000

出　　处：《物理学报》2024年第24期63-70,共8页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2022YFA1602504);国家自然科学基金(批准号:12204110,12374227,U1832201);上海市重点学科建设项目(批准号:B107);中国科学院战略性先导科技专项(B类)(批准号:XDB34020302)资助的课题.

摘　　要：高电荷态离子俘获靶原子、分子中的电子是一个多原子中心束缚态电子跃迁相关的基本原子物理过程,所形成的高激发态离子的退激辐射对于X射线天文建模、聚变等离子体诊断及离子束与物质作用机理研究等方面至关重要.经过不断的完善和发展,冷靶反冲离子动量谱仪(COLTRIMS)技术已经广泛应用于测量电子俘获过程中的量子态选择布居.基于复旦大学150 kV高电荷态离子碰撞实验平台及冷靶反冲离子动量谱仪,本文开展了1.4-20.0 keV/u的Ar8+炮弹离子与He原子碰撞过程中双电子俘获量子态选择截面的系统测量,并获得了3l 3l'至3l 7l'双激发态的相对截面.研究发现Ar8+-He双电子俘获过程中,随着碰撞能量的增大,更多的量子态转移反应通道被打开,而且量子态选择布居的相对截面对炮弹离子能量呈现强烈的依赖关系.Electron capture in the collision of highly charged ions with atoms and molecules is a fundamental process related to the electron transition between bound states belonging to two atomic-centers.The X-ray emission after electron capture is important for X-ray astrophysical modeling,fusion plasma diagnostics,and ion irradiated biophysics.In the past few decades,momentum-imaging cold-target recoil ion momentum spectroscopy has been a significantly developed technique and widely used to measure the quantum state-selective population in electron capture processes.Based on the cold target recoil ion momentum spectroscopy installed on the 150 kV highly charged ion platform in Fudan University,Shanghai City,China,the state-selectivity of double electron capture in the bombardment of 1.4-20 keV/u Ar8+on He is measured,and the relative cross sections of the 3l 3l'to 3l 7l'double excited states are obtained.It is found that with the increase of collision energy,more quantum state-selectivity channels are open in the double electron capture of Ar8+-He collision.It is also found that the relative cross section of the quantum state population is strongly dependent on the collision energy of the projectile ion.The present measurements not only enrich the state-selective cross-sectional library and collision dynamics of highly charged ion charge exchange processes,but also provide experimental benchmarks for existing theoretical calculations.

关 键 词：高电荷态离子 双电子俘获 量子态选择 冷靶反冲离子动量谱仪 

分 类 号：O441[理学—电磁学]