Mass spectra of argon clusters from a supersonic expansion measured by electron impact or photo ionization are similar to those obtained by Penning ionization. Associative ionization of clusters is not observed. This allows a determination of the condensed fraction in the beam. The mean cluster size is compared to data of other authors and heavy fragmentation of the clusters upon ionization is found. The ionized atom in a cluster will react very rapidly to a dimer ion, whose large binding energy of about 1 eV will lead to cluster fragmentation. A time table of events happening in a rare gas cluster after ionization is conjectured.
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Birkhofer et al. (1984) studied this question.
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