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首页> 中文期刊> 《中国物理快报：英文版》 >Double Electron Processes in Low Energy Isotope Bare Ions 13C6+ with Helium Collisions

Double Electron Processes in Low Energy Isotope Bare Ions 13C6+ with Helium Collisions

         
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摘要

@@ The isotopic bare ion 13C6+ 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.

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  • 来源
    《中国物理快报：英文版》 |2005年第6期|1398-1400|共3页
  • 作者

    YU De-Yang; SHAO Jian-Xiong; DING Bao-Wei; YANG Zhi-Hu; CHEN Xi-Meng; CAI Xiao-Hong; LU Rong-Chun; SHAO Cao-Jie; LU Jun; RUAN Fang-Fang; ZHANG Hong-Qiang; CUI Ying; XU Xu;

  • 作者单位

    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000;

    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000;

    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000;

    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000;

    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000;

    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000;

    Department of Modern Physics, Lanzhou University, Lanzhou 730000;

    Department of Modern Physics, Lanzhou University, Lanzhou 730000;

    Department of Modern Physics, Lanzhou University, Lanzhou 730000;

    Department of Modern Physics, Lanzhou University, Lanzhou 730000;

    Department of Modern Physics, Lanzhou University, Lanzhou 730000;

    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000;

    Department of Modern Physics, Lanzhou University, Lanzhou 730000;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 物理学;
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