The natural time scale for physical and chemical change in molecules is from tenths to hundreds of femtoseconds. Physical change in molecules is related among others with molecular vibration and energy relaxation. Chemical change deals with bond breaking and bond forming in chemical reactions. The last two decades have witnessed the advent and development of ultrafast laser technologies. One of the most recognized applications of these laser technologies to Chemistry has given rise to the birth of Femtochemistry, which is nowadays a scientific discipline by its own merits.
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