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Report No.

Photooxidation of trivalent americium in nitric acid

Matsuda, Shohei  ; Yokoyama, Keiichi  ; Yaita, Tsuyoshi; Kobayashi, Toru ; Nakashima, Nobuaki*

One of the spectroscopic properties for lanthanides and actinides is that they have f-f transitions in the visible region of their spectra. Those absorption appears at specific wavelength and has narrow line width even in the liquid phase owing to shielded f electrons. It has been reported that reduction reactions of Sm$$^{3+}$$, Eu$$^{3+}$$, and Yb$$^{3+}$$ are induced by multiphoton excitation through each f-f transition depending on conditions. This photochemical process may be applicable to mutual separation of f elements. In this study, we tried to optically control the oxidation state of americium. As a result, we found that trivalent americium (Am$$^{3+}$$) in nitric acid solution is oxidized to pentavalent one (AmO$$_{2}$$$$^{+}$$) during nanosecond pulsed-laser irradiation at 503 nm corresponding to the $$^{5}$$L$$_{6}$$ $$leftarrow$$ $$^{7}$$F$$_{0}$$ transition of Am$$^{3+}$$. Identification and quantification of the reactants and products were performed by absorption spectroscopy. Excitation wavelength dependence and fluence dependence of the oxidation suggest that it is initiated by a resonance-enhanced multiphoton process.



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