Infrared spectra of matrix‐isolated uranium oxide species. II. Spectral interpretation and structure of UO3

The midinfrared spectra of matrix‐isolated UO3 and its oxygen‐18 isotopes have been successfully interpreted in terms of a C2ν T‐shaped structure. Values of the two bond‐stretching and two bond‐interaction force constants determined by a normal coordinate analysis using 13 observed frequencies reproduce all peaks in the observed spectrum to within ± 0.6 cm−1. The following assignments for U16O3 species trapped in argon matrices have been obtained: ν1(A1) = 843.50, ν2(A1) = 745.65, ν4(B1) = 852.60 cm−1. The structure and intensity distribution are discussed in terms of current bonding theory for uranyl compounds.

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