Open AccessExperimental investigation of transfer ionization mechanism in slow He2+-He collisions
Author(s) -
Xiaolong Zhu,
Xueli Ma,
Bin Li,
Wei Feng,
Shaofeng Zhang,
Huiping Liu,
D B Qian,
Dacheng Zhang
Publication year - 2010
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.59.620
Subject(s) - atomic physics , ionization , recoil , autoionization , projectile , ion , physics , excited state , ground state , spectral line , helium , electron , momentum transfer , spectroscopy , photoionization , nuclear physics , scattering , quantum mechanics , astronomy , optics
The processes of transfer ionization in He2+-He collisions at energies ranging from 20 to 40 keV have been studied experimentally by means of cold target recoil ions momentum spectroscopy. From the longitudinal momentum spectra of recoil ions, different mechanisms of transfer ionization have been obtained. The results show that one of the electrons of helium atom being captured into the ground state of projectile ion He2+ and the other one emitted to the continuum state of projectile or target are the dominant mechanisms of transfer ionization. The autoionization cross section of projectile after two-electron capture into a double excited state is small. Transfer ionization for one target electron capture into ground state and the other one into the continuum of projectile mainly occurs at large impact parameter collisions.