Question

Raman signals are usually very weak. Describe one of the techniques that can used to increase the Raman signal and increase the sensitivity.

Answer 1

Raman signals involves energy absorption by the molecule thus  Raman scattered light has less energy than incident light. .,because of longer Wavelength, In which, The dmjor process is Rayleighscattering, and Raman scattering is an extremely weak process (only one in every 106 - 108 photons scatters) .

Raman signal enhancements are done by using non-linear optical effects, typically realized by mixing two or more wavelengths emitted by spatially and temporally synchronized pulsed lasers.

Surface-enhanced resonance Raman spectroscopy (SERRS) – A combination of SERS and resonanceRaman spectroscopy that uses proximity to a surface to increase Raman intensity, and excitation wavelength matched to the maximum absorbance of the molecule being analysed.