The microwave spectrum of cyclobutadiene iron tricarbonyl

M. A. Roehrig, P. Wikrent, S. R. Huber, D. E. Wigley, S. G. Kukolich

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The rotational spectrum of cyclobutadiene iron tricarbonyl was measured using a Flygare-Balle-type microwave spectrometer. Twenty a-dipole transitions were measured in the 5-16 GHz range for this prolate symmetric-top molecule. A least-squares fit of the data to a distortable symmetric top Hamiltonian yielded B = 961.9856(8) MHz, DJ = 0.184(8) kHz, DJK = 1.20(3) kHz. These results indicate that the vibrationally averaged structure of the cyclobutadiene ring is square and perpendicular to the a-molecular axis.

Original languageEnglish (US)
Pages (from-to)355-360
Number of pages6
JournalJournal of Molecular Spectroscopy
Issue number2
StatePublished - Aug 1992

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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