Raman scattering and infrared absorption spectroscopies are two complementary techniques that can be used to identify an unknown compound and test for its presence in a sample.
With infrared absorption, the material is illuminated by an infrared source. As the radiation passes through the sample, it causes vibrations that vary the bonds between atoms. For Raman scattering, a monochromatic light provided by a laser (visible or UV) illuminates the sample. Analysis of the light scattered by the sample reveals the presence of grains of light (photons), shifted by one vibrational energy from the laser.
These two complementary techniques each provide a different vibration spectrum of the sample. These line spectra are characteristic of the material, like a fingerprint. In particular, they provide information on its electronic structure, including the different types of bonds present.
To know the rates and have access to our infrared & Raman spectroscopies instruments, please contact us by email:
Collaboration with Arc’Antique, a conservation-restoration and research laboratory specializing in archaeological heritage, to study the chemical extraction of iron from waterlogged archaeological woods.
Resonant Raman scattering:
As part of the Edgefiller ANR, in collaboration with the Paul Pascal research center (Bordeaux) and CEMES (Toulouse), resonant Raman scattering (absorption-amplified Raman) was used to analyze a nanometric object.
Shown in red is a Raman spectrum of a dogbone (a carbon nanotube collapsed on itself). The AFM nanometric image is matched with the Raman mapping to locate the object and the corresponding Raman signal.
Infrared microscope:
As part of the Électrophone ANR, in collaboration with the LPR laboratory (Rennes), two articles have been published about the study of a transition in a photonic crystal [Fe(phen)2(NCS)2] depending on temperature:
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