Fragmentation and ion-scattering processes in the low-energy (0 similar to 200 eV) collisions of Sn-x(+) (x = 8 similar to 13) with a highly oriented pyrolytic graphite (HOPG) surface have been investigated by a tandem time-of-flight mass spectrometer. The fragmentation patterns in the lowest energy spectra changed drastically between Sn-11(+) and Sn-12(+) : Sn-6(+) and Sn-7(+) fragments were predominantly observed for the Sn-12(+) and Sn-13(+) incidences, while fragments such as Sn-x-1(+), Sn-x-2(+),.... were observed for Sn-x(+)(x = 8 similar to 11). Such characteristics are very similar to those reported in the dissociation studies of silicon and germanium cluster ions, and thus support the structural similarities among Si, Ge and Sn clusters.