Abstract
Mass-selected antimony cluster ions Sb +n (n = 3-12) and bismuth cluster ions Bi +{ntn} (n = 3-8) are allowed to collide with the surface of highly oriented pyrolytic graphite at energies up to 350 eV. The resulting fragment ions are analysed in a time-of-flight mass spectrometer. Two main fragmentation channels can be identified. At low impact energies both Sb +n and Bi +n cluster ions lose neutral tetramer and dimer units upon collision. Above about 150 eV impact energy Sb +3 becomes the predominant fragment ion of all investigated antimony clusters. The enhanced stability of these fragment clusters can be explained in the framework of the polyhedral skeletal electron pair theory. In contrast, Bi +n cluster scattering leads to the formation of Bi +3 , Bi +2 and Bi+ with nearly equal abundances, if the collision energy exceeds 75 eV. The integral scattering yield is substantially higher in this case as compared to Sb +n clusters.
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Bernhardt, T., Kaiser, B. & Rademann, K. Fragmentation of clusters induced by collision with a solid surface: comparison of antimony and bismuth cluster ions. Z Phys D - Atoms, Molecules and Clusters 40, 327–330 (1997). https://doi.org/10.1007/s004600050219
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DOI: https://doi.org/10.1007/s004600050219