Mr. Bernhard Kohn Profile

Bernhard Kohn

at MPI für Dynamik und Selbstorganisation

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Proceedings Article | 29 June 2001 Paper

Synthesis and characterization of iron clusters coated with hydrocarbons

Friedrich Huisken, Bernhard Kohn, Rodica Alexandrescu, Ion Morjan

Proceedings Volume 4430, (2001) https://doi.org/10.1117/12.432837

KEYWORDS: Iron, Chemical species, Carbon dioxide lasers, Molecules, Spectroscopy, Nanoparticles, Radon, Hydrogen, FT-IR spectroscopy, Particles

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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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