低能高电荷态离子(4≤q≤7)与He碰撞中双俘获与转移电离的截面反转效应  

Cross section invertion between double electron capture and transfer ionisation in low energy collision of highly charged ion(4≤q≤7) with He

作　　者：吕瑛[1] 陈熙萌[1] 曹柱荣[2] 吴卫东[2] 

机构地区：[1]兰州大学核科学与技术学院 [2]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《物理学报》2010年第6期3892-3896,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10134010;10375080;10304019)资助的课题~~

摘　　要：基于入射离子双俘获后势能沉积与双电离靶离子势能的比值定义了势能参数Ω,研究了低能高电荷态离子(q=4,5,6,7)与He原子碰撞系统中双俘获和转移电离反应道的选择规律.研究发现,在Ω坐标下,双俘获和转移电离存在截面反转效应,Ω<1.0时双俘获为双电子转移过程主反应道,Ω≥1.0时转移电离成为双电子转移过程主反应道.Based on the potential parameter Ω,which was defined as energy deposits ratio of incidence ion with target ion after double electron capture,the selection rule between double electron capture and transfer ionization of helium target induced by Aq＋ （q = 4,5,6,7） ions was studied. It is found that there is a cross point for the cross-section ratio curve of double electron capture and transfer ionization at Ω = 1. 0,and for Ω 1. 0 the double electron capture is a key reaction channel of double electron transfer,for Ω≥1. 0 the transfer ionization is a key reaction channel of double electron transfer.

关 键 词：离子-原子碰撞 势能参数 双俘获 转移电离 

分 类 号：O562.5[理学—原子与分子物理]