vibrational spectroscopy
Multidimensional Technique Enhances Vibrational Spectroscopy
By combining ultrashort pulses from a mid-infrared laser with pulses of visible light, chemists at the University of Illinois have added an important new dimension to vibrational spectroscopy. The new spectroscopic technique allows researchers to investigate vibrational energy redistribution in molecules with unprecedented detail.
“Molecules have specific vibrational motions, which can be used as spectral fingerprints,” said Dana Dlott, a UI professor of chemistry. “Our spectroscopic method allows us to monitor vibrational energy flow through a molecule on femtosecond time scales. We can therefore characterize the dynamic mechanical properties of molecules in real time — which is important in virtually every chemical process and of special interest in the field of nanotechnology, where machines will be the size of molecules.”
Ordinary infrared spectroscopy is a one-dimensional technique that is widely used to identify molecules by their spectral fingerprints. By adding both a time dimension and an additional spectral dimension, Dlott and his colleagues — postdoctoral research associate John Deàk and graduate student Lawrence Iwaki — have developed a three-dimensional technique that yields much more information. Instead of getting just a fingerprint, they obtain an entire library of “motion pictures.”
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