Ab Initio Study of Single-and Double-Electron Capture Processes in Collisions of He^(2+) Ions and Ne Atoms  

作　　者：Xiao-Xia Wang Kun Wang Yi-Geng Peng Chun-Hua Liu Ling Liu Yong Wu Heinz-Peter Liebermann Robert JBuenker Yi-Zhi Qu 王小霞;王堃;彭裔耕;刘春华;刘玲;吴勇;Heinz-Peter Liebermann;Robert JBuenker;屈一至(College of Material Sciences and Optoelectronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Environmental Science,Shanxi University,Taiyuan 030006,China;Department of Applied Physics,Nanjing University of Science and Technology,Nanjing 210094,China;School of Physics,Southeast University,Nanjing 210094,China;Data Center for High Energy Density Physics,Institute of Applied Physics and Computational Mathematics,Beijing 100088,China;Fachbereich C-Mathematik und Naturwissenschaften,Bergische Universitat Wuppertal,D-42097 Wuppertal,Germany)

机构地区：[1]College of Material Sciences and Optoelectronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China [2]Institute of Environmental Science,Shanxi University,Taiyuan 030006,China [3]Department of Applied Physics,Nanjing University of Science and Technology,Nanjing 210094,China [4]School of Physics,Southeast University,Nanjing 210094,China [5]Data Center for High Energy Density Physics,Institute of Applied Physics and Computational Mathematics,Beijing 100088,China [6]Fachbereich C-Mathematik und Naturwissenschaften,Bergische Universitat Wuppertal,D-42097 Wuppertal,Germany

出　　处：《Chinese Physics Letters》2021年第11期30-36,共7页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 11774344 and 11474033);the National Key Research and Development Program of China (Grant No. 2017YFA0402300)。

摘　　要：The single-and double-electron capture(SEC, DEC) processes of He^(2+) ions colliding with Ne atoms are studied by utilizing the full quantum-mechanical molecular-orbital close-coupling method. Total and state-selective SEC and DEC cross sections are presented in the energy region of 2 eV/u to 20 keV/u. Results show that the dominant reaction channel is Ne^(+)(2s2p^(6) ^(2)S) + He^(+)(1s) in the considered energy region due to strong couplings with the initial state Ne(2s^(2)2p^(6)^(1)S) + He^(2+) around the internuclear distance of 4.6 a.u. In our calculations, the SEC cross sections decrease initially and then increase whereby, the minimum point is around 0.38 keV/u with the increase of collision energies. After considering the effects of the electron translation factor(ETF), the SEC cross sections are increased by 15%–25% nearby the energy region of keV/u and agree better with the available results. The DEC cross sections are smaller than those of SEC because of the larger energy gaps and no strong couplings with the initial state. Due to the Demkov-type couplings between DEC channel Ne^(2+)(2s^(2)2p^(4)^(1)S) + He(1s^(2)) and the dominating SEC channel Ne^(+)(2s2p^(6) ^(2)S) + He^(+)(1s), the DEC cross sections increase with increasing impact energies. Good consistency can also be found between the present DEC and the experimental measurements in the overlapping energy region.

关 键 词：SEC DEC Ab Initio Study of Single-and Double-Electron Capture Processes in Collisions of He Ions and Ne Atoms 

分 类 号：O56[理学—原子与分子物理]