First observation of picosecond kinetics of hydrated electrons in supercritical water

世界初の超臨界水中水和電子の超高時間分解能測定

室屋 裕佐*; Lin, M.; De Waele, V.*; 籏野 嘉彦; 勝村 庸介; Mostafavi, M.*

Muroya, Yusa*; Lin, M.; De Waele, V.*; Hatano, Yoshihiko; Katsumura, Yosuke; Mostafavi, M.*

ピコ秒の時間分解能で実験可能な超臨界水のパルスラジオリシス実験システムを完成させいた。水和電子の挙動を近赤外領域で50ピコ秒から6ナノ秒の時間領域で測定した。超臨界水中の水和電子は密度に依存して500ピコ秒より短い時間で減衰する。この減衰は水和電子とHOとの反応が支配的である。

For the first time, a set-up is performed to carry out picoseconds time-resolved experiments in Supercritical Water (SCW) by pulse radiolysis. The kinetics of the decay of the hydrated electron is measured by transient absorption in the near IR on a time-scale ranging from 50 ps to 6 ns. The decay of the hydrated electrons in supercritical conditions shows a fast component at a short time below 500 ps, depending on the density of SCW. The results show that in SCW the main reaction for the decay of hydrated electron is that with HO.