Advantages of Cora 5001 Dual-Wavelength Instruments

With Anton Paar’s dual-wavelength Raman systems, fluorescence interference can be avoided by switching to a longer excitation wavelength. This allows to measure a larger variety of samples with a single small benchtop instrument.

Raman spectroscopy is a useful technique for the identification and characterization of molecular substances due to its sensitivity to vibrational bands, which represent a chemical fingerprint of a substance. However, the Raman bands may be overwhelmed by broad fluorescence bands that impair an algorithmic analysis. The fluorescence process is very strong compared to the Raman effect and is especially prominent in the Raman spectrum for deeply colored samples making these hard to analyze by Raman spectroscopy. Anton Paar’s Cora 5001 Raman spectrometers offer two excitation wavelengths in the same device so that fluorescence interference can be avoided by simply switching to the second excitation wavelength. Furthermore, an algorithmic baseline correction may be used to eliminate a moderate fluorescence background without altering the characteristic Raman bands. This report highlights the ease of use and performance of the Cora 5001 Raman spectrometers when faced with a colored aqueous solution as an example of a fluorescing compound.

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