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This paper reports that the ratios of double to single electron loss cross-section (R) of O^2+ in collision with Ar and He at the velocity of 1 -4 vo(vo is the Bohr velocity) have been obtained by the coincidence technique. The trend of R - V in the experiment indicates that the effective charge varies with injected velocity. The effective charge can be obtained by the n-body classical trajectory Monte Carlo method, which is interpreted by the molecular Coulomb over barrier model. 相似文献
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