Abstract
AbstractRecent theoretical and experimental studies are in conflict with our previous neutralization–reionization evidence for the surprising stability of simple ylides such as H2CCIH. Neutralization of [H2CCIH]+˙ ions from CICH2COOH with Hg followed by reionization of the resulting neutral molecules with O2 produces intense [CCIH3]+˙ parent ions. Collisionally activated dissociation of these mass‐selected ions shows that 47 ± 5% are the [H2CCIH]+˙ isomer. This demonstrates that stable H2CCIH molecules can be formed by neutralization, surviving intact for the lifetime of the experiment (10−6 s). Field ionization conditions effective in ionizing excited argon atoms do not produce appreciable ionization of the neutrals from [H2CCIH]+˙, suggesting that the stable H2CCIH neutrals are not Rydberg state molecules.
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