We report a femtosecond laser study of the tranisient absorption of hydrated electrons generated by 226nm two-photon ionization of liquid water under very high power laser density (up to 1.5TW/cm~2).The two photon absorption coefficient liquid water for femtosecond pulses at 266nm was determined to be #beta#=(1.8+-0.4)X10~(-11)m/W.The quantum yield of formation of the hydrated electron per absorbed photon at 266nm is determined to be 0.26+-0.02.We obaerved,for the first time,that the decay of the hydrated electron produced under 1.5TW/cm~2 laser pump power density in pure water is not only due to geminate recombination and that the survival probability of the hydrated electron at 1 ms is 0.16+-0.02 under those recombination and that the survival probability of the hydrated electron at 1 ns is 0.16+-0.02 under those conditions,where an unprecedented local concentratiion of the hydrated electron of 0.15M is produced.
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