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

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Abstract
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.