The lifetimes of long-lived parent anions formed by nondissociative electron attachment to SF6, C6F6, C10F8, and c-C7F14 are investigated. The ions are created via electron transfer in collisions with K(np) Rydberg atoms and their lifetimes determined by observing their decay using a Penning ion trap. The measured lifetimes vary widely from target to target and range from ∼10 μs for C6F6− to ∼10 ms for SF6−. The present results are compared with values obtained in earlier free-electron studies.
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Suess et al. (2002) studied this question.
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