マイナーアクチノイド錯イオンの赤外分光; SEIRA分光測定系の開発と実験の実際

Infrared spectroscopy of minor actinide complexes; Development of SEIRA measurement system for radioactive species

明地 省吾*; 平田 早紀子*; 日下 良二  ; 本田 匠*; 為国 誠太*; 村松 悟*; 齋藤 健一*; 平尾 岳大*; 灰野 岳晴*; 渡邉 雅之   ; 井口 佳哉*

Meiji, Shogo*; Hirata, Sakiko*; Kusaka, Ryoji; Honda, Takumi*; Tamekuni, Seita*; Muramatsu, Satoru*; Saito, Kenichi*; Hirao, Takehiro*; Haino, Takeharu*; Watanabe, Masayuki; Inokuchi, Yoshiya*

Recently, we have been performing surface-enhanced infrared absorption (SEIRA) spectroscopy of Eu complexes, aiming for clarifying the origin of selectivity of O-donor/N-donor ligands toward lanthanides (Ln)/minor actinides (MA) in radioactive waste treatments. In this study, we improved the SEIRA setup to extend the study to complexes of Am (MA), which is a radioactive nuclide. We made a new sample vessel with smaller internal volume and higher sealing ability, where we successfully reduced the radiation exposure (less than 1 Sv) during the experiment. In the actual measurement of AmDGA complex, the absorption of the C=O stretching of the amide unit was observed at 1621 cm; it is redshifted by 8 cm from the Eu complex, one of the lanthanides, which was supported by theoretical calculations.