DENTIFICATION OF MATRIX-ISOLATED PLUTONIUM OXIDES, PLUTONIUM NITRIDES, THORIUM NITRIDE AND THE THORIUM-DINITROGEN COMPLEX
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Date
1978
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Ohio State University
Abstract
Infrared absorption spectra of PuO, $PuO_{2}$, PuN, $PuN_{2}$ and ThN have been identified in both Ar and Kr matrices. Normal coordinate analysis of the measured frequencies of the $PuO_{2}$ isotopomers, $Pu^{16}O_{2}, Pu^{16}O^{18}O, Pu^{18}O_{2}$ showed that the molecule is linear with $f_{r} = 5.2476 \pm 0.0010$ and $f_{rr} = 0.0034 \pm 0.0010$ mdyn $\AA^{-1}$. The PuO molecule is stabilized in multi-pie sites in Ar matrices, but not in Kr. The plutonium dinitride molecule was found to be linear and only the $\nu_{3}$ stretching modes of the isotopomers were observed. No thorium dinitride molecule was observed. The ThN molecule was observed to exist in multiple sites in Ar matrices whereas PuN was not. A dinitrogen complex between Th and $N_{2}$ was produced in At by codeposition of sputtered Th atoms and $N_{2}$ gas. The geometry of the complex is $C_{2v}$ and the observed N-N stretching frequency indicates a strong Th - $N_{2}$ interaction.
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Author Institution: Chemical Engineering Division, Argonne National Laboratory