Abstract
Space-time evolution of a spark produced by ultrashort (25 psec) optical gas breakdown is reported. Experimental evidence is given for the consecutive occurrences of an electron thermal wave and an hydrodynamical shock as leading mechanisms for the plasma expansion. A theoretical model involving ionization of the medium is developed for the first process; it appears that the time dependence of the ionization has to be taken into account for a correct description of the early states of the plasma.
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