Infrared spectra of matrix-isolated UO+2 and NO−2

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Abstract
The reactions of UO and UO2 with NO and NO2 have been studied by infrared spectroscopy using the matrix isolation technique. Codeposition of vaporized UO and UO2 with NO2 and with NO gases in an argon matrix at 14 K resulted in the production of the UO+2 molecular ion paired with either a NO−2 or NO− anion. Three different reactions have been observed to yield a UO+2 cation product: (1) UO2+NO2, (2) UO2+NO, and (3) UO+NO2. Infrared absorption frequencies in the range 1150–1190 cm−1 have been measured and interpreted as the stretching modes of bent (bond angle = 109°) N16O−2, N16O18O−, and N18O−2 ions paired with UO+2. Infrared absorption frequencies in the range 770–900 cm−1 have been measured and interpreted as the stretching modes of linear U16O+2, U16O18O+, and U18O+2 paired with either NO− or NO−2.

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