  We studied the dynamics of solvated electrons in the early stage of plasma
generation in water induced with an intense femtosecond laser pulse. According
to the decay kinetics of solvated electrons, fast recombination process of
solvated electrons (geminate recombination) occurred with a more prolonged
lifetime (500 ps to 1 ns) than that observed in previous pulse photolysis
studies (10-100 ps). This unusually longer lifetime is attributed to additional
production of solvated electrons due to abundant free electrons generated with
the laser-induced plasma, implying significant influence of free electrons on
the dynamics of solvated electrons.
