Abstract
An explanation is suggested for the experimental fact that positronium formation in positron-impact double ionization is strongly suppressed for helium and neon, but less so for the other noble gases. Positronium is assumed to be formed in the collision but it may then break up as a result of the recapture of the electron by the residual ion. The probability of break up is expected to increase with the magnitude of the energy liberated to the positron in the recapture process, and this is consistent with the experimental data. The proposed mechanism also explains certain features of positronium formation in single ionization.
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