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Combining IR and Raman in 1 instrument

Infrared and Raman spectroscopies can observe different types of molecular vibrations. Using both methods on a compound provides a more complete molecular picture than either alone. But the two techniques are difficult to perform on a single instrument because of the difference in the wavelengths of light typically used as excitation sources—Raman spectroscopies use visible to near-infrared (NIR) light, and IR spectroscopy uses mid-IR (MIR) light. A team led by Takuro Ideguchi of the University of Tokyo has now built a system that can perform simultaneous IR and Raman spectroscopy (Nat. Commun. 2019, DOI: 10.1038/s41467-019-12442-9). By combining the two techniques into one instrument, researchers get more complete information and can save time and sample when analyzing a molecule’s vibrations. The researchers use an NIR femtosecond Ti:sapphire laser as the light source. The light pulses are used as is for Fourier transform coherent anti-Stokes Raman spectroscopy. For IR spectroscopy, a nonlinear