Double Electron Processes in Low Energy Isotope Bare Ions 13 C6+ with Helium Collisions
YU De-Yang1 , CAI Xiao-Hong1 , LU Rong-Chun1 , SHAO Cao-Jie1 , LU Jun1 , RUAN Fang-Fang1 , ZHANG Hong-Qiang2 , CUI Ying2 , XU Xu2 , SHAO Jian-Xiong2 , DING Bao-Wei2 , YANG Zhi-Hu1 , CHEN Xi-Meng2
1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
2 Department of Modern Physics, Lanzhou University, Lanzhou 730000
Double Electron Processes in Low Energy Isotope Bare Ions 13 C6+ with Helium Collisions
YU De-Yang1 ;CAI Xiao-Hong1 ;LU Rong-Chun1 ;SHAO Cao-Jie1 ;LU Jun1 ;RUAN Fang-Fang1 ;ZHANG Hong-Qiang2 ;CUI Ying2 ;XU Xu2 ;SHAO Jian-Xiong2 ;DING Bao-Wei2 ;YANG Zhi-Hu1 ;CHEN Xi-Meng2
1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
2 Department of Modern Physics, Lanzhou University, Lanzhou 730000
关键词 ：
34.70.+e ,
82.30.Fi
Abstract ： The isotopic bare ion 13 C6+ was employed to collide with helium at 4.15-11.08keV/u. The relative partial cross sections were measured by position-sensitive and time-of-flight coincident techniques. It is shown that the direct-ionization (DI) process can be completely ignored in this region, the transfer ionization (TI) process is the most important double-electron channel, and the probability of the pure double-electron capture (DC) process is quite small. The cross-section ratio of the total double-electron (DE) process (i.e. DC+TI) to the single-electron capture (SC) process is experimentally determined to be approximately a constant of 0.09 ± 0.03 in this region, and this value is obviously smaller than the predictions of the classical over-barrier models and the semi-empirical scaling laws. It is found that the cross-section ratio of pure DC to DE decreases obviously as the projectile velocity increases. Because the pure DC process only comes from the radiation de-excitation following the DC process and are competed by the TI process (comes from the auto-ionization following the DC process), this implies that the population of the two captured electrons depends distinctly on the collision velocity. Comparison with works on Ar16+ -He by Wu et al. [Phys. Rev. A 48 (1993) 3617] reveals that the strong projectile-dependent character of the pure DC process exists.
Key words ：
34.70.+e
82.30.Fi
出版日期: 2005-06-01
:
34.70.+e
(Charge transfer)
82.30.Fi
(Ion-molecule, ion-ion, and charge-transfer reactions)
引用本文:
YU De-Yang;CAI Xiao-Hong;LU Rong-Chun;SHAO Cao-Jie;LU Jun;RUAN Fang-Fang;ZHANG Hong-Qiang;CUI Ying;XU Xu;SHAO Jian-Xiong;DING Bao-Wei;YANG Zhi-Hu;CHEN Xi-Meng. Double Electron Processes in Low Energy Isotope Bare Ions 13 C6+ with Helium Collisions[J]. 中国物理快报, 2005, 22(6): 1398-1400.
13 C6+ with Helium Collisions. Chin. Phys. Lett., 2005, 22(6): 1398-1400.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2005/V22/I6/1398
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2005, Vol. 22 
