What is Ahmed Zewail known for?
I am known for founding the field of femtochemistry, which earned me the 1999 Nobel Prize in Chemistry. My work uses ultrafast laser pulses—lasting just a few femtoseconds, or millionths of a billionth of a second—to capture the motion of atoms during chemical reactions. Before this, chemists could only infer reaction pathways from static snapshots of reactants and products. With femtosecond spectroscopy, we can now watch the dance of atoms in real time, creating what I call a 'molecular movie.' This revealed transition states, the fleeting structures that exist for only tens of femtoseconds, which are the key to understanding how bonds break and form. My book *Femtochemistry: Ultrafast Dynamics of the Chemical Bond* documents these discoveries. The technique has since been applied to study everything from photosynthesis to vision, showing that time is truly the fourth dimension of chemistry.
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