Angular distribution of ejected electrons from 20 keV He<sup>+</sup> impact on He
N Tokoro; S Takenouchi; J Urakawa; N Oda; N Tokoro; Res. Lab. for Nuclear Reactor, Tokyo Inst. of Technol., Tokyo, Japan; S Takenouchi; Res. Lab. for Nuclear Reactor, Tokyo Inst. of Technol., Tokyo, Japan; J Urakawa; Res. Lab. for Nuclear Reactor, Tokyo Inst. of Technol., Tokyo, Japan; N Oda; Res. Lab. for Nuclear Reactor, Tokyo Inst. of Technol., Tokyo, Japan
Журнал:
Journal of Physics B: Atomic and Molecular Physics
Дата:
1982-10-28
Аннотация:
The angular distributions of ejected electrons in the energy range 5-70 eV have been measured at angles from 30 to 150 degrees for 20 keV He<sup>+</sup> impact on He. The angular dependence of excitation cross sections of autoionisation states 2s<sup>21</sup>S and 2p<sup>21</sup>D+2s2p<sup>1</sup>P are in good agreement with previous data measured by Bordenave-Montesquieu et al. (1982). The continuous parts of the electron spectra show symmetrical angular distributions around 90 degrees in the laboratory frame for low-energy electrons (<or=30 eV). These angular distributions are discussed in connection with the molecular autoionisation mechanism.
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