Abstract
In this work the charge state of the negatively charged gold nanocluster ions (2–20 nm) that were desorbed from nanodispersed gold islet targets by 252Cf fission fragments via electronic processes is studied. Mean cluster charge 〈 q〉 was calculated as a ratio of mean cluster mass 〈 m〉 to mean mass-to-charge ratio 〈 m/ q〉. Cluster masses were measured by means of a collector technique employing transmission electron microscopy and scanning force microscopy, while m/ q was measured by means of a tandem TOF-spectrometer. It is shown that the nanocluster ions are mostly multiply charged (2–16e) and the charge increases non-linearly with the cluster size. The results are discussed.
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