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A Study on the absorption spectra of Br$$^{-}$$, Br$$_{2}$$$$^{-.}$$, Br$$_{3}$$$$^{-}$$ in aqueous solutions at elevated temperatures

水溶液中のBr$$^{-}$$, Br$$_{2}$$$$^{-.}$$, Br$$_{3}$$$$^{-}$$の高温での吸収スペクトル測定

Lin, M.; 室屋 裕佐*; 勝村 庸介*; Archirel, P.*; Van-Oanh, N. T.*; 永石 隆二 ; 熊谷 友多   ; Mostafavi, M.*

Lin, M.; Muroya, Yusa*; Katsumura, Yosuke*; Archirel, P.*; Van-Oanh, N. T.*; Nagaishi, Ryuji; Kumagai, Yuta; Mostafavi, M.*

水溶液中Br$$^{-}$$, Br$$_{2}$$$$^{-.}$$, Br$$_{3}$$$$^{-}$$の吸収スペクトルの温度依存性をパルスラジオリシスと定常照射で測定した。Br$$_{2}$$$$^{-.}$$, Br$$_{3}$$$$^{-}$$はほとんど温度依存性を示さないのに対し、Br$$^{-}$$は長波長シフトを示す。Br$$^{-}$$のスペクトルシフトの実態を解明するため、量子化学計算を行った。温度によらず第一水和圏の水分子は陰イオンに強く結合していることがわかった。

The temperature dependent absorption spectra of Br$$^{-}$$, Br$$_{2}$$$$^{-.}$$ and Br$$_{3}$$$$^{-}$$ have been investigated by pulse radiolysis or steady-state irradiation. The spectra of Br$$_{2}$$$$^{-.}$$ and Br$$_{3}$$$$^{-}$$ exhibit almost no shift at the absorption maximum, while that of Br$$^{-}$$ shows a red-shift with increasing temperature. Quantum chemical calculations have been also performed to unveil the nature of the spectral shift of Br$$^{-}$$.

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