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Chin. Phys., 2007, Vol. 16(7): 2040-2043    DOI: 10.1088/1009-1963/16/7/039
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Investigation of transfer ionization in collisions of partially stripped carbon ions with helium at low to intermediate velocities

Chen Xi-Meng, Gao Zhi-Min, Liu Zhao-Yuan, Ding Bao-Wei, Lu Yan-Xia, Fu Hong-Bin, Shao Jian-Xiong, Cui Ying, Zhang Hong-Qiang, Liu Yu-Wen, Du Juan, Sun Guang-Zhi
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
Abstract  The ratios of transfer ionization (TI) to single-electron capture (SC) cross sections have been measured for the collisions of partially stripped Cq+ ions (q=1--4) with He. The collision velocity ranges from 0.7 to 4.4v0 (v0 is the Bohr velocity). The projectile-ion and recoil-ion coincidence technique is used to separate the processes of TI and SC. The ratios reach the maximum when the velocity is about 3.7v0 This can be explained qualitatively based on the two-step mechanism. The experimental results are also compared with the results calculated using the classical trajectory Monte Carlo (CTMC) method. The CTMC results are in agreement with the experimental data basically. The discrepancies in higher velocity region are interpreted by the effective charge effect.
Keywords:  cross-section ratios      ion--atom collision      transfer ionization      electron capture     
Received:  16 August 2006      Published:  04 July 2007
PACS:  34.50.Fa (Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))  
  34.70.+e (Charge transfer)  
Fund: Project supported by the Special Program for Key Basic Research of the Ministry of Science and Technology, China (Grant No 2002CCA00900).

Cite this article: 

Chen Xi-Meng, Gao Zhi-Min, Liu Zhao-Yuan, Ding Bao-Wei, Lu Yan-Xia, Fu Hong-Bin, Shao Jian-Xiong, Cui Ying, Zhang Hong-Qiang, Liu Yu-Wen, Du Juan, Sun Guang-Zhi Investigation of transfer ionization in collisions of partially stripped carbon ions with helium at low to intermediate velocities 2007 Chin. Phys. 16 2040

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