The ranges of validity of the Born and Bethe approximations for the single ionization of He+ and Li+ ions by electron impact
作者： B Peart , D S Walton , K T Dolder
DOI: 10.1088/0022-3700/2/12/314
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摘要: Absolute measurements have been made of cross sections for the single ionization He+ ions by electrons with energies which ranged from threshold (544 ev) to 10 kev. The results are in good agreement those an earlier experiment Dolder et al. (1961) was confined below 1 Cross Li+ also measured electron between 3 and 25 Comparison these calculations (performed elsewhere) based on Born Bethe approximations shows that, both ions, former approximation gives excellent experiments when exceed twenty times threshold, whilst is only valid greater than about 50 threshold.
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