ZhETF, Vol. 145,
p. 559 (March 2014)
(English translation - JETP,
Vol. 118, No. 3,
available online at www.springer.com
ULTRAFAST FORMATION OF HYDRATED ELECTRONS IN WATER AT HIGH CONCENTRATION: EXPERIMENTAL EVIDENCE OF THE FREE ELECTRON
Palianov P., Martin F., Quere F., Pommeret S.
Received: October 14, 2013
Using a time-resolved optical interferometric technique, we investigate the ultrafast primary events following the interaction of an ultrashort laser pulse with pure water in the TW/cm2 regime. Because our method is sensitive to the quasi-instantaneous electron energy level position, we demonstrate that in contrast to the well-known low-intensity regime, where the free electrons are instantaneously captured by pre-existing traps, in this new regime of excitation, free electrons are clearly observed, exhibiting a substantial contribution in the near IR. The delayed localization is attributed to the saturation of pre-existing cavities in the liquid by the large number of the excited electron states created.