29 June 2001 Synthesis and characterization of iron clusters coated with hydrocarbons
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Proceedings Volume 4430, ROMOPTO 2000: Sixth Conference on Optics; (2001) https://doi.org/10.1117/12.432837
Event: ROMOPTO 2000: Sixth Conference on Optics, 2000, Bucharest, Romania
Abstract
Iron clusters were produced by CO2-laser-induced decomposition of iron pentacarbonyl in a flow reactor using SF6 as a sensitizer. By adding hydrocarbon molecules (e.g. C2H4), which were also dissociated in the laser field, the iron clusters were allowed to react with several radicals. The as-synthesized species were extracted from the reaction zone by a conical nozzle and expanded into the source chamber of a cluster beam apparatus where they were analyzed with a time-of-flight mass spectrometer. At sufficiently high C2H4 concentration, we observed the appearance of a magic peak in the mass spectrum at mass m equals 884 amu. Using C2D4 instead of C2H4, the magic peak shifted by 12 amu to larger masses, indicating that the magic cluster must contain 12 hydrogen atoms. With the given restrictions, we readily derive the sum formula Fe13C12H12. Chemical stability and symmetry considerations suggest that the detailed chemical formula of the magic cluster is Fe13(C2H26 or Fe13(CequalsCH2)6 and that its structure corresponds to a Fe13 icosahedron with six HCequalsCH or CequalsCH2 groups bound to six pairs of the 12 iron surface atoms.
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Friedrich Huisken, Bernhard Kohn, Rodica Alexandrescu, Ion G. Morjan, "Synthesis and characterization of iron clusters coated with hydrocarbons", Proc. SPIE 4430, ROMOPTO 2000: Sixth Conference on Optics, (29 June 2001); doi: 10.1117/12.432837; https://doi.org/10.1117/12.432837
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