The evaporation of monomers following electron-impact ionization causes a significant enhancement of the intensity anomalies (``magic numbers'') in mass spectra of xenon clusters. The dissociation rates are measured on a microsecond time scale for clusters containing between 10 and 79 atoms. The highest dissociation probability, 99(1)%, is found for Xe₅₇{}⁺$, which is two atoms larger than a closed-shell icosahedral cluster. Each anomaly in the dissociation rates corresponds to an intensity anomaly (``magic number'') in the mass spectrum. Recent Monte Carlo simulations for Xeₙ{}⁺$, n{≤}30, are in full agreement with our experimental results.
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Kreisle et al. (1986) studied this question.
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