Abstract
The pure rotational spectrum of FeO + ( X 6Σ +) has been recorded using millimeter/submillimeter velocity modulation techniques, the first high-resolution measurement of a metal oxide cation. FeO + was created in an AC discharge from Fe(CO) 5 and N 2O. Nine rotational transitions were recorded in the range 299–544 GHz, each consisting of six fine-structure components. The data were analyzed with a case (b) Hamiltonian, and rotational and spin parameters determined. The spin–spin constant suggests a low-lying 4Σ − excited state. The bond length established for FeO +, r 0 = 1.641 Å, is slightly longer than that of FeO, consistent with a covalent bonding scheme.
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