Metal clusters embedded in ultracold helium nanodroplets are exposed to femtosecond laser pulses with intensities of . The influence of the matrix on the ionization and fragmentation dynamics is studied by pump-probe time-of-flight mass spectrometry. Special attention is paid to the generation of helium snowballs around positive metal ions (, ). Closings of the first and second helium shells are found for silver at and , as well as for magnesium at . The distinct abundance enhancement of helium snowballs in the presence of isolated atoms and small clusters in the droplets is used as a diagnostics to explore the cage effect. For silver, a reaggregation of the clusters is observed at after femtosecond laser excitation.
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