Classic Laser Raman Spectroscopy LRS

As acknowledged by the authors, the interpretation of the spectra is not straightforward, and the presence of different structures and particle sizes complicates the analysis, and further data are needed for a more complete interpretation. 

The surface fluorescence becomes a particular serious problem when the catalyst is contaminated with carbonaceous species, and therefore there are not many situations in which this technique has been applied to study coke on catalysts. 

---