Spectroscopy of Ethylenedione

Andrew R. Dixon, Tian Xue, Andrei Sanov

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The long sought-after, intrinsically short-lived molecule ethylenedione (OCCO) was observed and investigated by anion photoelectron spectroscopy. The adiabatic electron affinity of its quasi-bound 3Σg- state is 1.936(8) eV. The vibrational progression with a 417(15) cm-1 frequency observed within the triplet band corresponds to a trans-bending mode. Several dissociative singlet states are also observed, corresponding to two components of the 1Δg state and the 1Σg+ state. The experimental results are in agreement with theoretical predictions and constitute the first spectroscopic observation and characterization of this elusive compound.

Original languageEnglish (US)
Pages (from-to)8764-8767
Number of pages4
JournalAngewandte Chemie - International Edition
Issue number30
StatePublished - Jul 20 2015


  • anions
  • diradicals
  • electronic structure
  • photoelectron spectroscopy
  • transient molecules

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


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