  We present the results of an experiment on plasma generation via laser
ablation at 10^12 W/cm^2 of power intensity and in a nanosecond domain. Prompt
electrons emission and complex plasma plume fragmentation were simultaneously
observed for the first time in this laser intensity regime, along with a double
electron temperature inside the plasma bulk surviving for a long time to the
plume expansion. 1D PIC simulations are in agreement with experimental data as
long as the emission of initial prompt electrons is considered. This assumption
results to be the key to explain all the other experimental evidences.
