First observation of picosecond kinetics of hydrated electrons in supercritical water

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

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.