Metastable argon atoms are found to be forward scattered along with ground-state atoms after Ar⁺ + Ar charge-transferring collisions. Using a detection technique involving Penning ionization of acetylene, it was found that the cross section for metastable excitation has a magnitude of the order of 10^-3 ² and exhibits two distinct low-energy resonances as a function of incident Ar⁺ energy.
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Haugsjaa et al. (1969) studied this question.
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