When applied to the mass spectrum of argon, the techniques of Aston banding and I.P. curve comparison reveal the presence of metastable states of Ar + near the ionization threshold of Ar ++ . These metastable states make possible the collision charge-exchange reaction 10/20 with an over-all cross section at 1 kev of a least 2.5 Å 2 .
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McGowan et al. (1963) studied this question.
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