Synthesis and characterization of iron clusters coated with hydrocarbons

Friedrich Huisken; Bernhard Kohn; Rodica Alexandrescu; Ion G. Morjan

doi:10.1117/12.432837

29 June 2001 Synthesis and characterization of iron clusters coated with hydrocarbons

Friedrich Huisken, Bernhard Kohn, Rodica Alexandrescu, Ion G. Morjan

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.

Citation Download Citation

Friedrich Huisken, Bernhard Kohn, Rodica Alexandrescu, and Ion G. Morjan "Synthesis and characterization of iron clusters coated with hydrocarbons", Proc. SPIE 4430, ROMOPTO 2000: Sixth Conference on Optics, (29 June 2001); https://doi.org/10.1117/12.432837

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available