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The World`s Fastest Measurements of Molecular Vibrations When atoms or molecules are subject to a short, intense laser pulse, they emit high-frequency ultraviolet radiation. If you compare the spectra of isotopes that are of different masses but otherwise similar, you can use this measured radiation to determine the motion of the atoms. The research team used this method -with single, extremely short laser pulses - to make the fastest measurements of how a molecule changes over time.
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