On ionisation induced unimolecular dissociation of sodium clusters
- Cite this article as:
- Kappes, M.M., Schär, M., Schumacher, E. et al. Z Phys D - Atoms, Molecules and Clusters (1987) 5: 359. doi:10.1007/BF01385467
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Fragmentation of sodium cluster ions (Nax+,x<42) was studied via photoionisation of neutral precursors. Expansions of metal vapor out of cylindrical and conical nozzles yielded supersonic beams with differing cluster compositions. Measurements of photoionisation efficiency curves in the 3–6 eV range for both types of expansion allow quantitative separation of direct ionisation and unimolecular dissociation contributions to specific ion signals. Data for Na8+ and Na7+ are analysed to yield lower limits on bond energies. Results obtained for larger clusters are also discussed.